Electric hydraulic device of jack with improved structure

Abstract

The invention 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 invention belongs to the technical field of jacks, and in particular relates to an electric hydraulic device of a jack with an improved structure. Background Art

[0002] There are three driving modes for hydraulic jacks: manual drive, pneumatic drive and electric drive. Manual drive, i.e. manual hydraulic jack, uses a manual lever to operate the hydraulic pump to generate hydraulic pressure, thereby driving the hydraulic jack to work. It has certain advantages for outdoor or powerless occasions, but the operation is laborious and the lifting and lowering are slow. Pneumatic drive, i.e. pneumatic hydraulic jack, uses compressed gas to drive the piston movement, and has the advantages of fast response and convenient adjustment. It is widely used in machinery manufacturing, automobile maintenance and other fields. Electric drive, i.e. electric hydraulic jack, uses a motor to drive the balance valve or pump for lifting and lowering. It has fast speed and simple operation. It is often used in power equipment, vehicle maintenance and railway maintenance and other fields. Since electric drive, i.e. electric hydraulic jack, has the advantages of being able to meet the requirements of high efficiency, automated operation and relatively harsh working conditions, it is highly valued by the automobile repair and maintenance industry.

[0003] In the public Chinese patent documents, technical information related to electric or electric hydraulic jacks can be found, such as the "multifunctional electric jack for vehicles" recommended by CN202744265U and the "multifunctional electric jack for vehicles" provided by CN203877842U, etc. Although the above two patents have their own technical effects recorded in the technical effect column of their specifications. However, the following shortcomings are the same: since the piston rod (i.e., "cylinder column") needs to be extended and retracted by the forward and reverse rotation of the motor (see paragraphs 0015-0017 of the manual of CN202744265U and paragraph 0021 of the manual of CN203877842U for details), a reversing structure needs to be provided inside the valve body to adapt to the forward and reverse rotation of the motor, which results in a complicated valve body oil circuit, which not only increases the difficulty and cost of processing, but also increases the probability of failure during use accordingly; in the process of extending and retracting the piston rod (i.e., "cylinder column") by the forward and reverse rotation of the motor, and correspondingly driving the lifting arm and the pallet to rise and fall, the movement noise is loud and the components are prone to wear and aging.

[0004] In view of the above situation, it is necessary to make improvements. To this end, the applicant has conducted useful exploration and design and formed the technical solution to be introduced below. Summary of the invention

[0005] The task of the present invention is to provide an electric hydraulic device for a jack with a structure that helps to retract the cylinder column sleeve of the cylinder column into the cylinder without being controlled by a motor, thereby simplifying the valve body structure, reducing the difficulty of valve body processing, improving processing efficiency and saving processing costs, and is conducive to reducing operation noise and significantly reducing component wear to ensure the expected service life within a reasonable period.

[0006] The task of the present invention is accomplished in this way. An electric hydraulic device of a jack with an improved structure includes a motor, an oil pump, a valve body and an oil cylinder, and is characterized in that: it also includes a cylinder column retraction control mechanism, which is arranged on the valve body and communicates with the oil cylinder through an oil channel in the valve body; the motor is transmission-connected to the oil pump and the oil pump and the motor are arranged in a horizontal state on the left side of the valve body, and the oil cylinder is also arranged in a horizontal state on the right or left side of the valve body, and the oil pump is communicated with the oil cylinder through an oil channel opened in the valve body.

[0007] In a specific embodiment of the present invention, a pump oil chamber recessed in the left side surface of the valve body is provided at the central position on the left side of the valve body, and an oil pump chamber oil inlet hole, an oil pump chamber oil outlet hole, an oil pump driving shaft pivot support hole and an oil pump driven shaft pivot support hole are provided in the pump oil chamber, the oil pump chamber oil inlet hole and the oil pump chamber oil outlet hole are respectively communicated with the oil cylinder through an oil passage provided in the valve body, the oil pump cooperates with the pump oil chamber and also rotatably cooperates with the oil pump driving shaft pivot support hole and the oil pump driven shaft pivot support hole; an oil pump chamber oil inlet hole and an oil pump chamber oil outlet hole are respectively communicated with the oil cylinder through an oil passage provided in the valve body, the oil pump cooperates with the pump oil chamber and also rotatably cooperates with the oil pump driving shaft pivot support hole and the oil pump driven shaft pivot support hole; an oil pump chamber oil inlet hole and an oil pump chamber oil outlet hole are respectively communicated with the oil cylinder through an oil passage provided in the valve body A cylinder seat, which is constituted by a cylinder column sleeve matching cavity, in which a cylinder oil inlet hole and a cylinder oil return hole are provided, and on the right end surface of the cylinder seat of the cylinder seat, an oil storage chamber oil return hole, a pressure relief hole and an oil storage chamber oil suction hole are provided at intervals, the cylinder cooperates with the cylinder column sleeve matching cavity in a horizontal state, the cylinder oil inlet hole, the cylinder oil return hole, the oil storage chamber oil return hole, the pressure relief hole and the oil storage chamber oil suction hole are each communicated with the cylinder through an oil channel provided in the valve body; the cylinder column retraction control mechanism arranged on the valve body is communicated with the cylinder oil return hole and the oil storage chamber oil return hole.

[0008] In another specific embodiment of the present invention, the oil pump is drivingly connected to the motor through a transition connection mechanism arranged between the oil pump and the motor, the oil pump comprising 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, and an oil pump cover flange protruding from the right side surface of the oil pump cover is formed in the right middle area of ​​the oil pump cover and at a position corresponding to the pump oil chamber, the oil pump cover flange is inserted into the pump oil chamber to form a mutually compensating matching relationship with the pump oil chamber, and the oil pump cover is fixed to the valve body at a position corresponding to the oil pump cover fixing screw hole opened on the left side of the valve body by a group of oil pump cover fixing screws distributed at intervals, and a first oil guide groove and a second oil guide groove of the pump cover are formed on the right side of the oil pump cover, and the first and second oil guide grooves of the pump cover are mutually compensated. The oil inlet of the oil pump chamber corresponds to and is communicated with the first oil guide groove of the pump cover, the oil outlet of the oil pump chamber corresponds to and is communicated with the second oil guide groove of the pump cover, the left end of the oil pump driving shaft extends to the left side of the oil pump cover through the oil pump driving shaft hole opened in the central position of the oil pump cover and is transmission connected with the transition connection mechanism, and the right end of the oil pump driving shaft is rotatably supported in the oil pump driving shaft pivot support hole, the left end of the oil pump driven shaft is rotatably supported in the oil pump driven shaft support hole opened on the right side of the oil pump cover, and the right end of the oil pump driven shaft is rotatably supported in the oil pump driven shaft pivot support hole, the oil pump driving shaft gear is fixed on the oil pump driving shaft in the pump oil chamber, and the oil pump driven shaft gear is fixed on the oil pump driven shaft in the pump oil chamber and meshes with the oil pump driving shaft gear.

[0009] In another specific embodiment of the present invention, a pump cover flange sealing ring is arranged in the pump oil cavity, and the pump cover flange sealing ring is placed on the oil pump cover flange to form a sealing fit between the outer wall of the oil pump cover flange and the cavity wall of the pump oil cavity; an active shaft sealing sleeve hole with a diameter larger than the diameter of the oil pump active shaft hole is opened at the central position of the oil pump cover and at a position corresponding to the oil pump active shaft hole, and a main shaft sealing sleeve is embedded in the active shaft sealing sleeve hole, and the oil pump active shaft passes through the active shaft sealing sleeve after passing through the oil pump active shaft hole and extends to the left side of the active shaft sealing sleeve to be transmission-connected with the transition connection mechanism.

[0010] In another specific embodiment of the present invention, at least one pair of pump cover screw holes are provided on the oil pump cover; the transition connection mechanism includes an outer protective box, a transition connection sleeve, a motor shaft fixing plate and a motor fixing connection seat, the outer protective box is constituted of an outer protective box cavity with an open left side, a transition connection sleeve pivot position hole is provided on the cavity bottom wall on the right side of the outer protective box cavity and at the central position of the cavity bottom wall, the middle part of the transition connection sleeve corresponds to the transition connection sleeve pivot position hole, the left end extends into the outer protective box cavity, and the right end extends to the right side of the cavity bottom wall, the motor shaft fixing plate is arranged in the outer protective box cavity at a position corresponding to the left end of the transition connection sleeve, the motor fixing connection seat is arranged on the right side of the outer protective box, and the motor fixing connection seat is fixed to the left side of the oil pump cover by at least one pair of motor fixing connection seat screws that pass through the outer protective box screw holes provided on the outer protective box and then are screwed into the pump cover screw holes provided on the oil pump cover, and at the central position of the motor fixing connection seat A motor shaft through hole of the motor fixing connection seat is provided, which passes from the left side to the right side of the motor fixing connection seat, and the motor shaft through hole of the motor fixing connection seat corresponds to the motor shaft fixing plate hole provided at the central position of the motor shaft fixing plate, and a motor shaft fixing plate shaft head extends to the right at the central position of the right side of the motor shaft fixing plate, and the motor shaft fixing plate shaft head is connected to the oil pump driving shaft exploration hole provided at the central position of the transition sleeve and passes from the left end to the right end of the transition sleeve. The motor shaft of the motor faces right, and the motor shaft is inserted into the motor shaft fixing plate hole after passing through the motor shaft through hole of the motor fixing connection seat and is fixed with the motor shaft fixing plate flat key, and the motor is fixed to the left side of the motor fixing connection seat by a motor fixing screw; the left end of the oil pump driving shaft extends to the right end of the oil pump driving shaft exploration hole after passing through the driving shaft sealing sleeve and is fixed to the transition sleeve, and the motor shaft fixing plate shaft head is inserted into the left end of the oil pump driving shaft exploration hole and is fixed to the transition sleeve.

[0011] In another specific embodiment of the present invention, the cross-sectional shape of the left end of the oil pump driving shaft and the cross-sectional shape of the shaft head of the motor shaft fixing disk are both D-shaped, and 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 disk hole of the motor shaft fixing disk, 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 more specific embodiment of the present invention, a cylinder jacket fitting groove is provided on the right side surface of the cylinder seat in the central area on the right side of the valve body and around the circumferential direction of the cylinder seat. The cylinder comprises a cylinder jacket, a cylinder column sleeve, a cylinder oil storage chamber, a cylinder column and a pressure oil chamber. The left end of the cylinder jacket is sealed and fitted with the cylinder jacket fitting groove, the left end of the cylinder column sleeve is fitted with the cylinder column sleeve fitting chamber, and the cylinder storage chamber The oil chamber is located between the outer wall of the cylinder column sleeve and the inner wall of the cylinder outer sleeve. The cylinder column is located in the cylinder column sleeve so as to move left and right. A cylinder column piston is arranged at the left end of the cylinder column, and the pressure oil chamber is divided into a left oil chamber located on the left side of the cylinder column piston and a right oil chamber located on the right side of the cylinder column piston by the cylinder column piston; the cylinder oil inlet hole and the cylinder oil return hole are communicated with the left oil chamber; the oil storage chamber oil return hole, the pressure relief hole and the oil storage chamber oil suction hole are communicated with the cylinder oil storage chamber.

[0013] In a further specific embodiment of the present invention, a solenoid valve body fixing seat is formed in the middle part of the valve body and at a position corresponding to the upper part of the oil cylinder seat in a state of bulging out from the rear side surface of the valve body, and a solenoid valve body fixing hole is provided at a position corresponding to the solenoid valve body fixing seat; the oil cylinder column retraction control mechanism comprises a hydraulic solenoid valve with an electromagnetic coil and a valve core provided inside, the hydraulic solenoid valve is arranged on the solenoid valve body fixing seat at a position corresponding to the solenoid valve body fixing hole, the upper end of the hydraulic solenoid valve protrudes out of the upper surface of the solenoid valve body fixing seat, while the middle part and the lower end protrude into the solenoid valve body fixing hole, and is fixed by the valve body outer thread and the fixing hole wall thread formed on the inner wall of the solenoid valve body fixing hole, and is locked by the valve body locking nut, an upper sealing ring and a lower sealing ring are respectively sleeved at the lower end of the hydraulic solenoid valve and at the upper part and the lower part corresponding to the valve body outer thread, and the lower end port of the hydraulic solenoid valve is constructed as follows: The oil passage hole of the solenoid valve, and the area located between the upper and lower sealing rings constitutes a mesh oil passage part of the hydraulic solenoid valve, the lower end of the valve core is constituted by a valve, the oil return hole of the oil storage chamber is communicated with the oil passage hole of the solenoid valve through the oil return hole channel formed by the bottom of the solenoid valve body fixing hole, the oil return hole of the oil cylinder is communicated with the mesh oil passage part through the oil leakage hole channel formed by the solenoid valve body fixing hole and located between the upper and lower sealing rings, the passage between the oil passage hole of the solenoid valve and the mesh oil passage part is opened or closed by the upward or downward movement of the valve core together with the valve, and the upward or downward movement of the valve core together with the valve depends on the power on or off of the electromagnetic coil; wherein, a female socket for introducing a hydraulic solenoid valve working power supply electrically connected to the hydraulic solenoid valve is provided on one side accompanying the hydraulic solenoid valve, and the socket hole of the female socket for introducing the working power supply of the hydraulic solenoid valve cooperates with the male plug electrically connected to the external power supply.

[0014] In yet another specific embodiment of the present invention, an oil storage chamber oil suction channel is longitudinally opened in the middle of the valve body and at a position located on the left side of the cylinder column retraction control mechanism, the bottom of the oil storage chamber oil suction channel is communicated with the oil storage chamber oil suction hole, and the middle of the oil storage chamber oil suction channel is communicated with the pump oil chamber oil inlet hole, and an oil storage chamber oil suction channel steel ball valve for connecting or blocking the oil path between the oil storage chamber oil suction hole and the pump oil chamber oil inlet hole is arranged in the oil storage chamber oil suction channel, the upper end of the oil storage chamber oil suction channel is blocked by an oil storage chamber oil suction channel plug, and the oil storage chamber oil suction channel plug is threadedly fixed to the oil storage chamber oil suction channel plug hole opened on the valve body at a position located on the left side of the cylinder column retraction control mechanism.

[0015] In a further specific embodiment of the present invention, a pressure regulating valve hole is longitudinally provided in the middle of the valve body and at a position to the left and rear of the cylinder column retraction control mechanism, and a pressure relief hole oil channel on-off steel ball valve, a steel ball valve action spring and a spring pressure adjustment screw are arranged from bottom to top in the pressure regulating valve hole, and the pressure relief hole oil channel on-off steel ball valve is used to open or block the oil passage between the pressure relief hole and the oil outlet hole of the pump oil chamber, the lower end of the steel ball valve action spring is supported on the pressure relief hole oil channel on-off steel ball valve, and the upper end is supported on the lower end face of the spring pressure adjustment screw, and the spring pressure adjustment screw is fixed with the internal thread of the hole wall formed on the hole wall at the upper end of the pressure regulating valve hole; wherein, a pressure relief channel is provided in the valve body and at a position corresponding to the pressure relief hole oil channel on-off steel ball valve below, the pressure relief channel is communicated with the pressure relief hole and also communicated with the oil outlet hole of the pump oil chamber, and the opening and closing of the pressure relief hole oil channel on-off steel ball valve controls the on-off between the pressure relief channel and the pressure relief hole.

[0016] The technical effect of the technical solution provided by the present invention is that: since a cylinder column retraction control mechanism connected to the oil cylinder through the oil channel in the valve body is provided on the valve body, when the cylinder column of the oil cylinder is extended to lift the lifting arm of the jack to lift a load such as a vehicle and after the maintenance work is completed, when the cylinder column needs to be retracted and the load needs to be lowered, the load can be lowered as long as the cylinder column retraction control mechanism is energized, thereby avoiding the situation where the retraction of the cylinder column is controlled by the reverse operation of the motor; and since the motor does not need to adopt a motor with forward and reverse functions, the oil channel structure in the valve body can be significantly simplified, the difficulty of processing the valve body can be reduced, the processing efficiency can be improved, the processing cost can be saved, and it is beneficial to reduce the action noise and reduce the wear of components, which is very beneficial to ensure the expected service life of the jack within a reasonable period. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of an embodiment of the present invention; Figure 2 for Figure 1A structural diagram of the oil pump structure system shown in FIG. 1 , observed from the right side of the oil pump cover; Figure 3 for Figure 1 The structural diagram of the valve body as viewed from the left side; Figure 4 for Figure 1 The structural diagram of the valve body as shown in the figure is observed from the right side; Figure 5 for Figure 1 A cross-sectional view of the oil cylinder shown; Figure 6 To set in Figure 1 A schematic diagram of the oil storage channel of the oil suction chamber in the valve body shown; Figure 7 A schematic diagram of the oil inlet channel and the connecting oil channel opened at the left end of the valve body; Figure 8 for Figure 7 The schematic diagram of the oil inlet channel shown is connected to the oil inlet hole of the oil cylinder; Fig. 9 for Figure 1 The detailed structural diagram of the cylinder rod retraction control mechanism shown; Fig.10 for Figure 4 and Figures 6 to 8 The oil return hole of the cylinder shown is Fig. 9 A schematic diagram of a mesh-type oil-passing part communicating with each other as shown; Fig.11 A schematic diagram of a pressure regulating valve hole provided in a valve body; Fig.12 It is a schematic diagram of an application example of the present invention. DETAILED DESCRIPTION

[0018] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description in the form of embodiments below. However, the description of the embodiments is not a limitation of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical solution of the present invention.

[0019] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on the current Figure 1 The position state is taken as a reference, and thus it cannot be understood as a special limitation on the technical solution provided by the present invention.

[0020] See also Figure 1, showing a motor 1, an oil pump 2, a valve body 3 (also referred to as a "valve seat", the same below) and an oil cylinder 4. As the technical key points of the technical solution provided by the present invention: the structural system of the electric hydraulic device of the aforementioned jack also includes an oil cylinder column retraction control mechanism 6, which is arranged on the aforementioned valve body 3 and communicates with the aforementioned oil cylinder 4 through an oil passage opened in the valve body 3; the aforementioned motor 1 is transmission-connected with the aforementioned oil pump 2 and the oil pump 2 and the motor 1 are arranged in a horizontal state on the left side of the aforementioned valve body 3. In this embodiment, the aforementioned 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 as needed, and the aforementioned oil pump 2 communicates with the aforementioned oil cylinder 4 through an oil passage opened in the valve body 3. In this embodiment, the aforementioned oil pump is preferably, but not limited to, a gear pump.

[0021] See you next time Figure 1 A pump oil chamber 31 is provided at the central position on the left side of the aforementioned valve body 3 and is recessed in the left side surface of the valve body 3. A pump oil chamber oil inlet hole 311, a pump oil chamber oil outlet hole 312, an oil pump driving shaft pivot support hole 313 and an oil pump driven shaft pivot support hole 314 are provided in the pump oil chamber 31. The pump oil chamber oil inlet hole 311 and the pump oil chamber oil outlet hole 312 are respectively communicated with the aforementioned oil cylinder 4 through an oil channel provided in the valve body 3. The aforementioned oil pump 2 cooperates with the pump oil chamber 31 and is also rotationally cooperated with the aforementioned oil pump driving shaft pivot support hole 313 and the oil pump driven shaft pivot support hole 314.

[0022] See also Figure 4 In the central area on the right side of the valve body 3, a cylinder seat 32 is formed. The cylinder seat 32 is formed with a cylinder sleeve matching cavity 321. A cylinder oil inlet hole 3211 and a cylinder oil return hole 3212 are provided in the cylinder sleeve matching cavity 321. On the right end surface 322 of the cylinder seat 32, an oil storage cavity oil return hole 3221, a pressure relief hole 3222 and an oil storage cavity oil suction hole 3223 are provided at intervals. In the horizontal state, it cooperates with the aforementioned cylinder column sleeve matching cavity 321, and the aforementioned cylinder oil inlet hole 3211, cylinder oil return hole 3212, oil storage chamber oil return hole 3221, pressure relief hole 3222 and oil storage chamber oil suction hole 3223 are each connected with the aforementioned cylinder 4 through the oil channel opened in the valve body 3; the aforementioned cylinder column retraction control mechanism 6 arranged on the aforementioned valve body 3 is connected with the aforementioned cylinder oil return hole 3212 and the oil storage chamber oil return hole 3221.

[0023] Please see the key Figures 1 to 3The oil pump 2 is connected to the motor 1 through a transition connection mechanism 5 provided between the oil pump 2 and the motor 1. That is to say, the motor 1 is connected to the oil pump 2 through the transition connection mechanism 5. The oil pump 2 includes 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. A protruding portion is formed in the middle area of ​​the right side of the oil pump cover 21 and at a position corresponding to the oil pump chamber 31. The oil pump cover flange 211 on the right side of the oil pump cover 21 is inserted into the pump oil cavity 31 to form a mutually compensating matching relationship with the pump oil cavity 31, and the oil pump cover 21 is fixed to the valve body 3 at a position corresponding to the oil pump cover fixing screw hole 315 opened on the left side of the aforementioned valve body 3 by a group of oil pump cover fixing screws 212 distributed at intervals. 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 in the figure, the first and second oil guide grooves 217 and 218 of the pump cover are connected to each other, the aforementioned pump oil chamber oil inlet hole 311 corresponds to and communicates with the first oil guide groove 217 of the pump cover, the aforementioned pump oil chamber oil outlet hole 312 corresponds to and communicates with the second oil guide groove 218 of the pump cover, 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 opened at the central position of the oil pump cover 21 and is transmission-connected to the aforementioned transition connection mechanism 5, and the right end of the oil pump driving shaft 22 is rotatably supported In the aforementioned oil pump driving shaft pivot support hole 313, 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, and 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 driving shaft gear 24 is fixed to the aforementioned oil pump driving shaft 22 in the aforementioned pump oil chamber 31, and the oil pump driven shaft gear 25 is fixed to the aforementioned oil pump driven shaft 23 in the aforementioned pump oil chamber 31 and meshes with the oil pump driving shaft gear 24.

[0024] A pump cover flange sealing ring 316 is arranged in the aforementioned pump oil chamber 31, and the pump cover flange sealing ring 316 is sleeved on the aforementioned oil pump cover flange 211 to form a sealing fit between the outer wall of the oil pump cover flange 211 and the cavity wall of the pump oil chamber 31; an active shaft sealing sleeve hole 215 with a diameter larger than the diameter of the oil pump active shaft hole 213 is opened at the central position of the aforementioned oil pump cover 21 and at a position corresponding to the aforementioned oil pump active shaft hole 213, and a main shaft sealing sleeve 2151 is embedded in the active shaft sealing sleeve hole 215, and the aforementioned oil pump active shaft 22 passes through the active shaft sealing sleeve 2151 after passing through the oil pump active shaft hole 213 and extends to the left side of the active shaft sealing sleeve 2151 to be transmission-connected with the aforementioned transition connection mechanism 5.

[0025] The applicant needs to explain that if the form is changed and the oil cylinder 4 is arranged together with the oil pump 2 and the motor 1 on the same side of the valve body 3, such as the left side or the right side, then it should be regarded as an equivalent technical means and still falls within the technical connotation scope disclosed in the present invention. When the oil cylinder 4 is arranged on the left side of the valve body 3, the aforementioned oil cylinder seat 32 and related components arranged with the oil cylinder seat 32 as a 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 oil drain hole channel 3312 are also correspondingly transferred with the transfer of the oil cylinder seat 32 to the left side.

[0026] See the key points Figure 1A pair of pump cover screw holes 216 are provided on the aforementioned oil pump cover 21, but the number is not limited to the number shown in the figure; the aforementioned transition connection mechanism 5 includes an outer protective box 51, a transition connection sleeve 52, a motor shaft fixing plate 53 and a motor fixing connection seat 54, the outer protective box 51 is formed with an outer protective box cavity 511 with an open left side, and a transition connection sleeve pivot transfer hole 512 is provided on the cavity bottom wall on the right side of the outer protective box cavity 511 and at the central position of the cavity bottom wall, the middle part of the transition connection sleeve 52 corresponds to the transition connection sleeve pivot transfer hole 512, and the left end is inserted into the outer protective box cavity 511, and The right end extends to the right side of the bottom wall of the aforementioned cavity, the motor shaft fixing plate 53 is arranged in the outer casing cavity 511 at a position corresponding to the left end of the transition sleeve 52, the motor fixing connection seat 54 is arranged on the right side of the aforementioned outer casing 51, and the motor fixing connection seat 54 is fixed to the left side of the oil pump cover 21 by a pair of motor fixing connection seat screws 542, which are not limited to the number shown in the figure, passing through the outer casing screw hole 513 opened on the outer casing 51 and then screwing into the aforementioned pump cover screw hole 216 opened on the aforementioned oil pump cover 21. A self-motor fixing screw is opened at the central position of the motor fixing connection seat 54. The left side of the fixed connection seat 54 passes through the motor shaft through hole 541 of the motor fixed connection seat on the right side. The motor shaft through hole 541 of the motor fixed connection seat corresponds to the motor shaft fixing plate hole 531 opened at the central position of the motor shaft fixing plate 53. The motor shaft fixing plate hole 531 is a blind hole. A motor shaft fixing plate shaft head 532 extends to the right from the central position of the right side of the aforementioned motor shaft fixing plate 53. The motor shaft fixing plate shaft head 532 is connected to the oil pump driving shaft insertion hole 521 opened at the central position of the transition connection sleeve 52 and passing through from the left end to the right end of the transition connection sleeve 52. The motor shaft 11 of the aforementioned motor 1 faces rightward, and the motor shaft 11 passes through the motor shaft through hole 541 of the motor fixing connection seat and then is inserted into the motor shaft fixing plate hole 531 and is fixed with the motor shaft fixing plate 53 by a flat key. The motor 1 is fixed to the left side of the motor fixing connection seat 54 by the motor fixing screw 12; the left end of the aforementioned oil pump driving shaft 22 extends to the right end of the aforementioned oil pump driving shaft exploration hole 521 after passing through the aforementioned driving shaft sealing sleeve 2151 and is fixed to the transition connection sleeve 52, and the aforementioned motor shaft fixing plate shaft head 532 is inserted into the left end of the oil pump driving shaft exploration hole 521 and is fixed to the transition connection sleeve 52.

[0027] See you next time Figure 1 The cross-sectional shape of the left end of the aforementioned oil pump driving shaft 22 and the cross-sectional shape of the motor shaft fixing plate shaft head 532 are both D-shaped, and the cross-sectional shape of the aforementioned oil pump driving shaft insertion hole 521 is also D-shaped. A motor shaft key matching groove is formed on the hole wall of the motor shaft fixing plate hole 531 of the aforementioned motor shaft fixing plate 53, and a motor shaft key is formed on the aforementioned motor shaft 11 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.

[0028] See also Figure 5 And combined with Figure 1 and Figure 4 A cylinder jacket fitting groove 323 ( Figure 4 ); the aforementioned oil cylinder 4 comprises an oil cylinder jacket 41, an oil cylinder column sleeve 42, an oil cylinder oil storage chamber 43, an oil cylinder column 44 and a pressure oil chamber 45. The left end of the oil cylinder jacket 41 is sealed and fitted with the aforementioned oil cylinder jacket fitting groove 323. The left end of the oil cylinder column sleeve 42 is fitted with the aforementioned oil cylinder column sleeve fitting chamber 321. The oil cylinder oil storage chamber 43 is located between the outer wall of the oil cylinder column sleeve 42 and the inner wall of the oil cylinder jacket 41. The oil cylinder column 44 is movably located in the oil cylinder column sleeve 42. A oil cylinder column piston 441 is provided at the left end of the oil cylinder column 44. A piston sealing ring 4411 is provided on the outer wall of 41, and the cylinder column piston 441 divides the aforementioned pressure oil chamber 45 into a left oil chamber 451 located on the left side of the cylinder column piston 441 and a right oil chamber 452 located on the right side of the cylinder column piston 441, and is sealed by the piston sealing ring 4411; the aforementioned cylinder oil inlet hole 3211 and the cylinder oil return hole 3212 are communicated with the aforementioned left oil chamber 451; the aforementioned oil storage chamber return hole 3221, the pressure relief hole 3222 and the oil storage chamber oil suction hole 3223 are communicated with the aforementioned cylinder oil storage chamber 43.

[0029] In order to facilitate understanding of the present invention, Figure 1 It also shows the Fig.12 The oil cylinder column push shaft 76 of the structural system of the jack 7 shown in the figure has an oil cylinder column articulated shaft head 442 extending from the central position of the right end face of the aforementioned oil cylinder column 44, and an articulated shaft head cotter pin hole 4421 is provided on the oil cylinder column articulated shaft head 442, and an oil cylinder column articulated shaft head matching hole 761 is provided in the middle of the length direction of the aforementioned oil cylinder column push shaft 76 and at a position corresponding to the oil cylinder column articulated shaft head 442, and an oil cylinder column articulated shaft head matching hole 761 is provided at the upper and lower parts of the oil cylinder column push shaft 76 and at a position corresponding to the oil cylinder column articulated shaft head 442. A corresponding cylinder column push shaft cotter pin hole 762 is provided at the position of the connecting shaft head matching hole 761. The cylinder column push shaft cotter pin hole 762 is communicated with the cylinder column articulating shaft head matching hole 761. After the aforementioned cylinder column articulating shaft head 442 is inserted into the cylinder column articulating shaft head matching hole 761, the cotter pin 7621 is inserted into the articulating shaft head cotter pin hole 4421 through the cylinder column push shaft cotter pin hole 762 to articulate the cylinder column articulating shaft head 442 with the cylinder column push shaft 76 (also called "connected").

[0030] See also Figures 7 to 10A solenoid valve body fixing seat 33 is formed in the middle of the valve body 3 and at a position corresponding to the upper side of the oil cylinder seat 32 in a state of bulging out of the rear side surface of the valve body 3, and a solenoid valve body fixing hole 331 is provided at a position corresponding to the solenoid valve body fixing seat 33; Fig. 9 As shown, the aforementioned oil cylinder column retraction control mechanism 6 includes a hydraulic solenoid valve 61 with an electromagnetic coil and a valve core 616 inside. The hydraulic solenoid valve 61 is arranged on the solenoid valve body fixing seat 33 at a position corresponding to the aforementioned solenoid valve body fixing hole 331. The upper end of the hydraulic solenoid valve 61 protrudes from the upper surface of the solenoid valve body fixing seat 33, while the middle part and the lower end protrude into the solenoid valve body fixing hole 331. The valve body thread 611 is connected to the fixing on the inner wall of the solenoid valve body fixing hole 331. The hole wall is threadedly fixed and locked by the valve body locking nut 618. An upper sealing ring 612 and a lower sealing ring 613 are respectively sleeved on the lower end of the hydraulic solenoid valve 61 and on the upper and lower parts corresponding to the valve body thread 611. The lower end port of the hydraulic solenoid valve 61 constitutes a solenoid valve oil hole 614, and the area between the upper and lower sealing rings 612 and 613 constitutes a mesh oil passage portion 615 of the hydraulic solenoid valve 61. The lower end of the valve core 616 constitutes a valve 6 161, the aforementioned oil storage chamber oil return hole 3221 is communicated with the aforementioned solenoid valve oil through hole 614 through the oil return hole channel 3311 formed by the bottom of the solenoid valve body fixing hole 331, and the aforementioned oil cylinder oil return hole 3212 is communicated with the aforementioned mesh oil through hole 615 through the oil leakage hole channel 3312 formed by the solenoid valve body fixing hole 331 and located between the upper and lower sealing rings 612, 613. The aforementioned solenoid valve is opened by the upward or downward movement of the aforementioned valve core 616 together with the valve 6161. The passage between the oil hole 614 and the aforementioned mesh oil passage 615 is opened or closed, and the upward or downward movement of the aforementioned valve core 616 together with the aforementioned valve 6161 depends on whether the aforementioned electromagnetic coil is energized or de-energized; wherein, a hydraulic solenoid valve working power supply introduction female socket 617 electrically connected to the hydraulic solenoid valve 61 is provided on one side accompanying the aforementioned hydraulic solenoid valve 61, and the socket hole 6171 of the hydraulic solenoid valve working power supply introduction female socket 617 cooperates with the male plug electrically connected to the external power supply.

[0031] See also Fig.11In the middle of the aforementioned valve body 3 and at a position on the left side of the aforementioned cylinder column retraction control mechanism 6, an oil storage chamber oil suction channel 34 is longitudinally opened, the bottom of the oil storage chamber oil suction channel 34 is communicated with the aforementioned oil storage chamber oil suction hole 3223, and the middle of the oil storage chamber oil suction channel 34 is communicated with the aforementioned pump oil chamber oil inlet hole 311, and an oil storage chamber oil suction channel steel ball valve 341 is arranged in the oil storage chamber oil suction channel 34 for connecting or blocking the oil path between the oil storage chamber oil suction hole 3223 and the pump oil chamber oil inlet hole 311, the upper end of the oil storage chamber oil suction channel 34 is blocked by an oil storage chamber oil suction channel plug 342, and the oil storage chamber oil suction channel plug 342 is threadedly fixed to the oil storage chamber oil suction channel plug hole 35 opened on the valve body 3 at a position on the left side of the aforementioned cylinder column retraction control mechanism 6.

[0032] Please refer to Fig.11 A pressure regulating valve hole 36 is longitudinally provided in the middle of the valve body 3 and at a position to the left and rear of the cylinder column retraction control mechanism 6. A pressure relief hole oil passage on-off steel ball valve 361, a steel ball valve action spring 362 and a spring pressure adjustment screw 363 are arranged from bottom to top 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 oil outlet hole 312 of the pump oil chamber. The lower end of the steel ball valve action spring 362 is supported on the pressure relief hole oil passage on-off steel ball valve 361. 61, and the upper end is supported on the lower end face of the spring pressure adjusting screw 363, and the spring pressure adjusting screw 363 is fixed with the inner thread of the hole wall formed on the upper end of the pressure regulating valve hole 36; wherein, a pressure relief passage 364 (also called "pressure relief oil passage") is provided in the aforementioned valve body 3 and at a position corresponding to the lower side of the aforementioned pressure relief hole oil passage on-off steel ball valve 361, and the pressure relief passage 364 is communicated with the aforementioned pressure relief hole 3222, and is communicated with the pump oil chamber oil outlet hole 312 through the connecting oil passage 38 to be mentioned below. The opening and closing of the aforementioned pressure relief hole oil passage on-off steel ball valve 361 controls the on-off (i.e., opening or closing) between the pressure relief passage 364 and the pressure relief hole 3222.

[0033] See also Figure 7 and Figure 8 ,exist Figure 7 The figure shows an oil inlet channel 37 opened in the valve body 3 in a horizontal state, i.e., in a horizontal state, and a connecting oil channel 38 opened in a longitudinal state. The connecting oil channel 38 is communicated with the aforementioned pump oil chamber oil outlet hole 312, and the connecting oil channel 38 is also communicated with the oil inlet channel 37. At the bottom of the connecting oil channel 38, i.e., the oil channel sealing portion of the connecting oil channel 38, there is a connecting oil channel oil plug 381 threadedly connected to the connecting oil channel oil plug hole at the lower left end of the valve body 3. Figure 8The aforementioned oil inlet channel 37 is communicated with the aforementioned cylinder oil inlet hole 3211, and an oil inlet channel oil plug 371 is provided at the left end of the oil inlet channel 37, i.e., the oil channel sealing position, and is threadedly connected to the oil inlet channel oil plug hole opened on the left side of the valve body 3.

[0034] See also Fig.12 ,exist Fig.12 The jack 7 mentioned above and the oil cylinder column push shaft 76 mentioned above are shown in the figure. The two ends of the oil cylinder column push shaft 76, i.e., the front end and the rear end, are hinged to one end of a pair of connecting pieces 77 of the structural system of the jack 7, and the other ends of the pair of connecting pieces 77 are hinged to the front and rear sides of the left end of the lifting arm 73 of the structural system of the jack 7 through the chain plate hinge pin 771. The left and right ends of the pair of wall panels 71 are each provided with a walking wheel 72 through a walking wheel shaft 721. Fig.12 Also shown is the left end of a pair of connecting rods 74 hinged between the left ends of the opposite sides of a pair of wall panels 71 through a pair of connecting rod hinge bolts 741, and the right ends of the pair of connecting rods 74 are hinged to a lifting arm top seat 731 located on the upper part of the right end of the lifting arm 73 and in a U-shaped shape through a lifting arm top seat hinge pin 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 7311, the left end of the lifting arm 73 is hinged between the opposite sides of the left ends of a pair of wall panels 71 through a lifting arm hinge shaft 732, and the right end of the lifting arm 73 is configured as a free end that can be raised upward or reset downward, and a tray 75 is hinged on the upward side of the lifting arm top seat 731 through a tray fixing screw 751. The tray 75 can also be called a tray, which is used to lift loads such as vehicle chassis and the like. Specifically, when the cylinder column 44 of the oil cylinder 4 of the present invention extends out of the cylinder body, that is, extends to the right, the cylinder column hinge shaft head 442 of the cylinder column 44 acts on the aforementioned cylinder column push shaft 76, and the lifting arm 73 rotates counterclockwise around the lifting arm hinge shaft 732, and the right end of the lifting arm 73, together with the lifting arm top seat 731 and the tray 75, rises upward to lift the load upward. At the same time, the left ends of the pair of connecting rods 74 also rotate counterclockwise accordingly, and the right ends rise upward with the lifting arm top seat 731. The connecting rods 74 pull the lifting arm top seat 731 to rotate clockwise around the lifting arm top seat hinge pin 7311, so that the tray 75 remains in a horizontal state during the lifting process. Vice versa.

[0035] The applicant also needs to emphasize that: if the aforementioned oil pump 2 and valve body 3 are integrated into an integral structure for the purpose of circumventing the present invention, then it should be regarded as equivalent to the structure of fixing the oil pump cover 21 as the oil pump body with the oil pump cover fixing screw hole 315 opened on the valve body 3 through the oil pump cover fixing screw 212 of the present application; and if the structure of the oil cylinder 4 is changed in form but not in substance in order to increase the oil volume of the oil cylinder storage chamber 43 of the structural system of the aforementioned oil cylinder 4 (i.e., increase the oil storage volume), for example, abandoning the oil cylinder storage chamber 43 and configuring an oil tank and setting the oil tank at a reasonable position and making adaptive changes to the oil passage on the valve body 3, then it should also be regarded that such changes still fall within the technical connotation scope disclosed by the present invention. The rest of the mechanisms that are not repeated one by one are the same.

[0036] The applicant is targeting the aforementioned Fig.12 And combined with Figures 1 to 11 Briefly describe the working process of the present invention. Fig.12 Take the lifting arm 73 of the jack 7 shown in the figure to drive the tray 75 to lift the load as an example. With the support of the power supply, the motor 1 is powered and works. Since the motor shaft 11 is key-connected with 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. Since the motor shaft fixing plate shaft head 532 of the right side of the motor shaft fixing plate 53 is D-shaped and connected with the oil pump driving shaft insertion hole 521 of the transition sleeve 52, which is also D-shaped in cross section, and since the left end of the oil pump driving shaft 22 of the structural system of the oil pump 2 is D-shaped in cross section (i.e., the left end of the oil pump driving shaft 22 is structurally The transition sleeve 52 is connected to the oil pump driving shaft insertion hole 521 of the transition sleeve 52, so that when the motor shaft fixing plate 53 driven by the motor shaft 11 rotates, the motor shaft fixing plate shaft head 532 drives the transition sleeve 52, and the transition sleeve 52 drives the oil pump driving shaft 22 to rotate, and the oil pump driving shaft 22 drives the oil pump driving shaft gear 24, and the oil pump driving shaft gear 24 drives the oil pump driven shaft gear 25 meshing therewith, so that the entire oil pump 2 is in a working state. When the aforementioned oil pump is in a working state, oil enters the oil inlet hole 311 of the pump oil chamber. At this time, Figure 6 The steel ball valve 341 in the oil storage chamber suction channel 34 shown in the figure is pushed open by the oil pressure and displaced to the upper end (upper part) of the oil storage chamber suction channel 34, so that the channel between the oil storage chamber suction hole 3223 and the pump oil chamber oil inlet hole 311 is unblocked, and the oil enters the aforementioned and is Figure 1 and Figure 3 The pump oil chamber 31 shown in the figure then passes through Figure 2 The first oil guide groove 217 and the second oil guide groove 218 of the pump cover and the oil outlet hole 312 of the pump oil chamber are then sequentially introduced into the Figure 7The schematic diagram shows the connecting oil passage 38 and the oil inlet passage 37. The oil flows through the oil inlet passage 37, the oil cylinder oil inlet hole 3211 and the oil inlet passage 37. Figure 5 The pressure oil chamber 451 of the oil cylinder 4 shown in the figure, forces the oil cylinder rod 44 to extend rightward, that is, out of the cylinder body, by the pressure of the hydraulic oil, thereby pushing the aforementioned and Figure 1 and Fig.12 The oil cylinder column push shaft 76 shown in the figure acts on the lifting arm 73 ( Fig.12 As shown in the figure, the left end of the lifting arm 73 rotates counterclockwise around the lifting arm hinge shaft 732, so that the right end as the free end of the lifting arm 73 rises upward together with the tray 75. Since the tray 75 is in contact with the load, the load is lifted upward by the tray 75.

[0037] The lifting arm 73 descends during the following process: the hydraulic solenoid valve 61 of the structural system of the oil cylinder column retracting control mechanism 6 is energized, that is, the solenoid coil is energized, and the hydraulic solenoid valve 61 of the oil cylinder column retracting control mechanism 6 is energized. Fig. 9 The valve core 616 of the hydraulic solenoid valve 61 shown in detail together with the valve 6161 moves upward, and the oil flows from Fig.10 The oil return hole 3212 of the oil cylinder and the mesh oil passage 615 (also called "mesh oil return section") are shown in FIG. Fig. 9 The oil passage 614 of the solenoid valve is shown in the figure, and then the oil return passage 3311 ( Fig. 9 As shown) and the oil storage cavity due to the oil hole 3221 into the Figure 5 The oil storage chamber 43 of the oil cylinder 4 is shown in the diagram. In the above process, the oil cylinder column 44 retracts into the oil cylinder 4, and during the retraction process, the oil cylinder column push shaft 76 is driven to move in the opposite direction to the above, so that the lifting arm 73 moves clockwise around the oil cylinder column push shaft 76, and the above free end of the lifting arm 73, that is, the right end, 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.

[0038] The automatic pressure relief process is: during the oil pumping process, when the pressure exceeds the Fig.11 When the spring pressure adjusting screw 363 shown in the figure adjusts the preset (predetermined) safety pressure of the steel ball valve acting spring 362, the oil flows from Fig.10 The oil outlet hole 312 of the pump oil chamber shown in the figure is successively passed through the aforementioned connecting oil passage 38, the pressure relief oil passage 364 opened in the valve body 3 and connected to the connecting oil passage 38, and then after the pressure relief hole oil passage on-off steel ball valve 361 is opened, it is returned to the oil return hole 3222 of the oil storage chamber by Figure 5 The oil storage chamber 43 of the oil cylinder 4 shown in the figure can automatically relieve pressure when overpressure occurs.

[0039] In summary, the technical solution provided by the present invention makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. An electro-hydraulic device of a jack with improved structure, comprising a motor (1), an oil pump (2), a valve body (3) and an oil cylinder (4), characterized in that: The invention also comprises a cylinder column retraction control mechanism (6), which is arranged on the valve body (3) and communicates with the cylinder (4) through an oil passage in the valve body (3); the motor (1) is transmission-connected with the oil pump (2), and the oil pump (2) and the motor (1) are arranged in a horizontal position on the left side of the valve body (3), while the cylinder (4) is also arranged in a horizontal position on the right or left side of the valve body (3), and the oil pump (2) communicates with the cylinder (4) through an oil passage opened in the valve body (3).

2. The electro-hydraulic device of the jack with improved structure according to claim 1, characterized in that: A pump oil chamber (31) is provided at the central position on the left side of the valve body (3) and is recessed in the left side surface of the valve body (3). A pump oil chamber oil inlet hole (311), a pump oil chamber oil outlet hole (312), an oil pump driving shaft pivot support hole (313) and an oil pump driven shaft pivot support hole (314) are provided in the pump oil chamber (31). The pump oil chamber oil inlet hole (311) and the pump oil chamber oil outlet hole (312) are communicated with the oil cylinder (4) through an oil passage provided in the valve body (3). The oil pump (2) cooperates with the pump oil chamber (31) and also rotatably cooperates with the oil pump driving shaft pivot support hole (313) and the oil pump driven shaft pivot support hole (314). A cylinder seat (32) is formed in the central area on the right side of the valve body (3). The cylinder seat (32) is formed with a cylinder sleeve matching cavity (321). An oil cylinder oil inlet hole (3211) and an oil cylinder oil return hole (3212) are provided in the oil cylinder 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 provided at intervals on the right end surface (322) of the oil cylinder seat (32). The oil cylinder (4) matches the oil cylinder sleeve matching cavity (321) in a horizontal state. The cylinder oil inlet hole (3211), the cylinder oil return hole (3212), the oil storage chamber oil return hole (3221), the pressure relief hole (3222) and the oil storage chamber oil suction hole (3223) are each connected to the oil cylinder (4) via an oil passage provided in the valve body (3); the cylinder column retraction control mechanism (6) provided on the valve body (3) is connected to the cylinder oil return hole (3212) and the oil storage chamber oil return hole (3221).

3. The electro-hydraulic device of the jack with improved structure according to claim 2, characterized in that: The oil pump (2) is drivingly connected to the motor (1) via a transition connection mechanism (5) disposed 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 formed in the middle area on the right side of the oil pump cover (21) and at a position corresponding to the pump oil chamber (31). The oil pump cover flange (211) is inserted into the pump oil cavity (31) to form a mutually compensating matching relationship with the pump oil cavity (31), and 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 a position corresponding to the oil pump cover fixing screw hole (315) opened on the left side of the valve body (3). A first oil guide groove (217) and a second oil guide groove (218) of the pump cover are formed on the right side of the oil pump cover (21). The first and second oil guide grooves (217, 218) of the pump cover are mutually connected. The oil inlet hole (311) of the pump oil chamber corresponds to and communicates with the first oil guide groove (217) of the pump cover, the oil outlet hole (312) of the pump oil chamber corresponds to and communicates with the second oil guide groove (218) of the pump cover, the left end of the oil pump driving shaft (22) extends to the left side of the oil pump cover (21) via the oil pump driving shaft hole (213) provided at the central position of the oil pump cover (21) and is transmission-connected with the transition connection mechanism (5), and the right end of the oil pump driving shaft (22) is rotatably supported in the oil pump driving shaft pivot support hole (3 13), the left end of the oil pump driven shaft (23) is rotatably supported in an oil pump driven shaft support hole (214) opened on the right side of the oil pump cover (21), and the right end of the oil pump driven shaft (23) is rotatably supported in the oil pump driven shaft pivot support hole (314), the oil pump driving shaft gear (24) is fixed to the oil pump driving shaft (22) in the pump oil chamber (31), and the oil pump driven shaft gear (25) is fixed to the oil pump driven shaft (23) in the pump oil chamber (31) and meshes with the oil pump driving shaft gear (24).

4. The electro-hydraulic device of the jack with improved structure according to claim 3, characterized in that: A pump cover flange sealing ring (316) is arranged in the pump oil cavity (31), and the pump cover flange sealing ring (316) 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 cavity wall of the pump oil cavity (31); an active shaft sealing sleeve hole (215) having a diameter greater than the diameter of the oil pump active shaft hole (213) is opened at the central position of the oil pump cover (21) and at a position corresponding to the oil pump active shaft hole (213), and a main shaft sealing sleeve (2151) is embedded in the active shaft sealing sleeve hole (215); the oil pump active shaft (22) passes through the oil pump active shaft hole (213) and then passes through the active shaft sealing sleeve (2151) and extends to the left side of the active shaft sealing sleeve (2151) to be transmission-connected with the transition connection mechanism (5).

5. The electro-hydraulic device of the jack with improved structure according to claim 3, characterized in that: At least one pair of pump cover screw holes (216) is provided on the oil pump cover (21); the transition connection mechanism (5) comprises an outer casing (51), a transition connection sleeve (52), a motor shaft fixing plate (53) and a motor fixing connection seat (54); the outer casing (51) is formed with an outer casing cavity (511) with an opening on the left side; a transition connection sleeve pivoting position hole (512) is provided on the right side bottom wall of the outer casing cavity (511) and at the center of the cavity bottom wall; the middle part of the transition connection sleeve (52) corresponds to the transition connection sleeve pivoting position hole (512), and the left end thereof protrudes into the outer casing cavity (511); The right end extends to the right side of the bottom wall of the cavity, the motor shaft fixing plate (53) is arranged in the outer casing cavity (511) at a position corresponding to the left end of the transition sleeve (52), the motor fixing connection seat (54) is arranged on the right side of the outer casing (51), and the motor fixing connection seat (54) is fixed to the left side of the oil pump cover (21) by at least one pair of motor fixing connection seat screws (542) passing through the outer casing screw holes (513) opened on the outer casing (51) and then screwed into the pump cover screw holes (216) opened on the oil pump cover (21), and a self-motor fixing screw is opened at the central position of the motor fixing connection seat (54). The left side of the fixed connection seat (54) passes through the motor shaft through hole (541) of the motor fixed connection seat on the right side. The motor shaft through hole (541) of the motor fixed connection seat corresponds to the motor shaft fixing plate hole (531) opened at the central position of the motor shaft fixing plate (53). A motor shaft fixing plate shaft head (532) extends rightward from the central position of the right side of the motor shaft fixing plate (53). The motor shaft fixing plate shaft head (532) is connected to the oil pump driving shaft insertion hole (521) opened at the central position of the transition connection sleeve (52) and passes through from the left end to the right end of the transition connection sleeve (52). The motor shaft (1) of the motor (1) 1) toward the right, the motor shaft (11) passes through the motor shaft through hole (541) of the motor fixing connection seat and then is inserted into the motor shaft fixing plate hole (531) and is fixed with the motor shaft fixing plate (53) by a flat key, and the motor (1) is fixed to the left side of the motor fixing connection seat (54) by a motor fixing screw (12); the left end of the oil pump driving shaft (22) passes through the driving shaft sealing sleeve (2151) and then extends to the right end of the oil pump driving shaft insertion hole (521) and is fixed with the transition connection sleeve (52), and the motor shaft fixing plate shaft head (532) is inserted into the left end of the oil pump driving shaft insertion hole (521) and is fixed with the transition connection sleeve (52).

6. The electro-hydraulic device of the jack with improved structure according to claim 5, characterized in that: 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 plate shaft head (532) are both D-shaped, and 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 on the hole wall of the motor shaft fixing plate hole (531) of the motor shaft fixing plate (53), and a motor shaft key is formed on the motor shaft (11) and at a position corresponding to the motor shaft key matching groove, and the motor shaft key matches the motor shaft key matching groove.

7. The electro-hydraulic device of the jack with improved structure according to claim 2, characterized in that: A cylinder sleeve fitting groove (323) is provided on the right side surface of the cylinder seat (32) in the central area on the right side of the valve body (3) and around the circumferential direction of the cylinder seat (32). The cylinder (4) comprises a cylinder sleeve (41), a cylinder column sleeve (42), a cylinder oil storage chamber (43), a cylinder column (44) and a pressure oil chamber (45). The left end of the cylinder sleeve (41) is sealed and fitted with the cylinder sleeve fitting groove (323). The left end of the cylinder column sleeve (42) is fitted with the cylinder column sleeve fitting chamber (321). The cylinder oil storage chamber (43) is located between the outer wall of the cylinder column sleeve (42) and the cylinder sleeve (45). 1), the oil cylinder column (44) is movably located in the oil cylinder column sleeve (42), and a oil cylinder column piston (441) is provided at the left end of the oil cylinder column (44), and the oil cylinder column piston (441) divides the pressure oil chamber (45) into a left oil chamber (451) located on the left side of the oil cylinder column piston (441) and a right oil chamber (452) located on the right side of the oil cylinder column piston (441); the oil cylinder oil inlet hole (3211) and the oil cylinder oil return hole (3212) are in communication with the left oil chamber (451); the oil storage chamber oil return hole (3221), the pressure relief hole (3222) and the oil storage chamber oil suction hole (3223) are in communication with the oil cylinder oil storage chamber (43).

8. The electro-hydraulic device of the jack with improved structure according to claim 2, characterized in that: A solenoid valve body fixing seat (33) is formed in the middle of the valve body (3) and at a position corresponding to the upper side of the oil cylinder seat (32) in a state of bulging out from the rear side surface of the valve body (3), and a solenoid valve body fixing hole (331) is provided at a position corresponding to the solenoid valve body fixing seat (33); the oil cylinder column retraction control mechanism (6) comprises a hydraulic solenoid valve (61) having a solenoid coil and a valve core (616) arranged therein, the hydraulic solenoid valve (61) being arranged on the solenoid valve body fixing seat (33) at a position corresponding to the solenoid valve body fixing hole (331), and the upper end of the hydraulic solenoid valve (61) protrudes out. The upper surface of the solenoid valve body fixing seat (33) is provided, and the middle part and the lower end are inserted into the solenoid valve body fixing hole (331), and the valve body outer thread (611) is threadedly fixed to the fixing hole wall formed on the inner wall of the solenoid 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 at the lower end of the hydraulic solenoid valve (61) and at the upper part and the lower part corresponding to the valve body outer thread (611). The lower end port of the hydraulic solenoid valve (61) is formed as a solenoid valve oil through hole (614), and the upper and lower sealing rings (612, 613) are respectively provided. The area between the two parts constitutes a mesh oil passage portion (615) of the hydraulic solenoid valve (61), the lower end of the valve core (616) is formed with a valve (6161), the oil return hole (3221) of the oil storage chamber is communicated with the oil passage hole (614) of the solenoid valve through an oil return hole channel (3311) formed by the bottom of the solenoid valve body fixing hole (331), the oil return hole (3212) of the oil cylinder is communicated with the mesh oil passage portion (615) through an oil drain hole channel (3312) formed by the solenoid valve body fixing hole (331) and located between the upper and lower sealing rings (612, 613), and the valve core (6 16) Together with the upward or downward movement of the valve (6161), the passage between the solenoid valve oil hole (614) and the mesh oil passage portion (615) is opened or closed, and the upward or downward movement of the valve core (616) together with the valve (6161) depends on whether the solenoid coil is energized or de-energized; wherein, a hydraulic solenoid valve working power supply introduction female socket (617) electrically connected to the hydraulic solenoid valve (61) is provided on one side accompanying the hydraulic solenoid valve (61), and the socket hole (6171) of the hydraulic solenoid valve working power supply introduction female socket (617) cooperates with the male plug electrically connected to the external power supply.

9. The electro-hydraulic device of the jack with improved structure according to claim 2, characterized in that: An oil storage chamber oil suction passage (34) is longitudinally provided in the middle of the valve body (3) and at a position on the left side of the oil cylinder column retraction control mechanism (6). The bottom of the oil storage chamber oil suction passage (34) is communicated with the oil storage chamber oil suction hole (3223), and the middle of the oil storage chamber oil suction passage (34) is communicated with the pump oil chamber oil inlet hole (311). A valve for allowing the oil storage chamber to suck oil is provided in the oil storage chamber oil suction passage (34). The oil path between the oil hole (3223) and the pump oil chamber oil inlet hole (311) is communicated with or blocked by a steel ball valve (341) for the oil storage chamber oil suction channel. The upper end of the oil storage chamber oil suction channel (34) is blocked by an oil storage chamber oil suction channel plug (342). The oil storage chamber oil suction channel plug (342) is threadedly fixed to the oil storage chamber oil suction channel plug hole (35) opened on the valve body (3) at a position located on the left side of the oil cylinder column retraction control mechanism (6).

10. The electro-hydraulic device of the jack with improved structure according to claim 2, characterized in that: A pressure regulating valve hole (36) is longitudinally provided in the middle of the valve body (3) and at a position slightly to the left and rear of the oil cylinder column retraction control mechanism (6). A pressure relief hole oil passage on-off steel ball valve (361), a steel ball valve action spring (362) and a spring pressure adjustment screw (363) are arranged from bottom to top 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 oil outlet hole (312) of the pump oil chamber. The lower end of the steel ball valve action spring (362) is supported on the pressure relief hole oil passage on-off steel ball valve (361), while the upper end is supported on the pressure relief hole oil passage on-off steel ball valve (361). The spring pressure adjusting screw (363) is supported on the lower end face of the spring pressure adjusting screw (363), and the spring pressure adjusting screw (363) is fixed with the inner thread of the hole wall formed on the upper end of the pressure regulating valve hole (36); wherein a pressure relief channel (364) is provided in the valve body (3) and at a position corresponding to the lower side of the pressure relief hole oil passage on-off steel ball valve (361), and the pressure relief channel (364) is communicated with the pressure relief hole (3222) and also communicated with the oil outlet hole (312) of the pump oil chamber, and the on-off between the pressure relief channel (364) and the pressure relief hole (3222) is controlled by the opening and closing of the pressure relief hole oil passage on-off steel ball valve (361).

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