Electric hydraulic device of jack

Abstract

An electric hydraulic device of a jack belongs to the technical field of hoisting facilities. Which comprises a motor, an oil pump, a valve body and an oil cylinder, and is characterized in that the motor is in transmission connection with the oil pump, the motor and the oil pump are horizontally arranged on the left side of the valve body, the oil cylinder is horizontally arranged on the right side of the valve body, and the oil pump is a gear pump and is communicated with the oil cylinder through an oil channel formed in the valve body. The advantages are that the structure is simplified and the size is reduced; the motor and the oil pump are arranged on the same side of the valve body, and the oil cylinder is arranged on the other side of the valve body, so that space is optimized, components and weight are reasonably distributed relative to the valve body, maintenance is facilitated, flow resistance of hydraulic oil serving as fluid can be reduced, and the service life of the valve body is prolonged. And on the other hand, the installation reliability and the use safety can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting facilities, and in particular relates to an electric hydraulic device of a jack. Background Art

[0002] As is known in the industry, the driving modes of hydraulic jacks are divided into manual and electric. In terms of driving mode: manual hydraulic jacks use manpower or other mechanical manual to drive the hydraulic pump of the structural system of the hydraulic device, and send the hydraulic oil as a fluid to the actuator such as the piston rod; in terms of effect: electric hydraulic jacks use motors to drive the hydraulic pump of the structural system of the hydraulic device to realize the operation of the hydraulic system. The operation of manual hydraulic jacks is relatively simple, but it requires manpower to drive, so the efficiency is low, and it is suitable for simple manual operations; electric hydraulic jacks are driven by electricity, so the work efficiency is high, and it is suitable for relatively complex hydraulic systems, especially in occasions that require high efficiency and automated operation; in terms of applicable scenarios: manual hydraulic jacks are suitable for small equipment and manual operation occasions, and the operation is relatively flexible, but the maintenance cost is high. Electric hydraulic jacks are suitable for large institutions and automated equipment. Although the maintenance cost is low, the requirements for maintenance personnel are relatively high. In short, manual hydraulic jacks are suitable for occasions that require low cost of manpower operation, while electric hydraulic jacks are suitable for complex environments that require high efficiency and automated operation.

[0003] In the public Chinese patent documents, technical information related to electric hydraulic jacks can be found, such as CN102530767B recommending "an oil pump device for an electric hydraulic jack with an integrated valve body", which directly sets the oil pump in an oil tank made of elastic material and in a concave shape tilted 90° to the left. The top body of the structural system of the hydraulic jacking device is longitudinally arranged at a position corresponding to the space of the concave shape and forms a vertical relationship with the motor arranged in a horizontal state. Since the patent requires the use of an oil tank and forms an oil circuit relationship between the oil tank, the oil pump, and the hydraulic jacking device, although it has the advantages of reasonably reducing the volume and reducing the probability of oil leakage as described in paragraph 0017 of its specification, it is relatively troublesome to manufacture and assemble and makes the overall structure complicated. In addition, since an independent oil tank is required, it cannot actually achieve the effect of small volume. Another example is CN202274265U, which provides a "multifunctional manual jack for vehicles". This patent has the advantage of integrating the dual functions of an air pump and an oil pump, but it also uses a single-row oil tank with the same structure as that mentioned in CN102530767B and transfers the oil pump outside the oil tank, so to a certain extent, it also has the shortcomings of the aforementioned CN102530767B. In addition, the patent uses a gear pump driven by a motor as an oil pump, but does not specifically provide a revelation that the connection and seal between the motor and the gear pump as the oil pump are reliable to avoid oil leakage, because the sealing effect between the oil pump and the valve body has always been a difficult problem for the industry. In particular, CN202274265U sets the motor and the oil pump on both sides of the valve body respectively, and the oil pump establishes an oil circuit relationship with the oil tank and the oil cylinder. This layout method will make the entire hydraulic mechanism more dispersed in space. Although it has certain advantages in terms of convenience and flexibility of installation, it is compact and causes a large volume. For example, CN207877842U introduces "a multifunctional electric jack for vehicles", and the patent is equipped with a reduction box for the motor, and the rest is basically the same as the aforementioned CN202274265U; then, CN201704016U announces "a jack for vehicles", and the combination relationship of the motor, oil tank, gear pump, and valve body involved in the patent structure is also basically the same as the aforementioned CN202274265U; and CN221216969U involves "a pump core structure of an electric hydraulic horizontal jack hydraulic pump", and the structural system of the oil pump of this patent adopts an eccentric wheel driven by a motor, which can be specifically referred to in paragraphs 0033 to 0034 of the patent specification. The eccentric movement of the eccentric wheel causes the pump body connected to it to produce periodic volume changes, thereby realizing the direct oil suction and discharge functions, but due to the limitations of the eccentric wheel movement characteristics, the flow and pressure fluctuations are large, so it is not suitable for occasions with certain requirements for flow and pressure stability.

[0004] Not limited to the above-mentioned patents, although each has the technical effects recorded in the technical effect column of its specification, at the same time each has the above-mentioned shortcomings. Therefore, it is necessary to carry out a reasonable design that takes advantage of their strengths and suppresses their weaknesses. The technical solution to be introduced below is produced in this context. Summary of the invention

[0005] The task of the present invention is to provide an electric hydraulic device for a jack that helps to abandon the oil tank and form a transmission relationship that is directly connected between the motor and the oil pump, thereby significantly simplifying the structure and reducing the volume, and is conducive to arranging the motor and the oil pump on the same side of the valve body and arranging the oil cylinder on the other side of the valve body, thereby optimizing the space, making the weight distribution reasonable, facilitating maintenance, reducing the flow resistance of the hydraulic oil as a fluid, and being reliable to install and safe to use.

[0006] The task of the present invention is accomplished in this way. An electric hydraulic device for a jack includes a motor, an oil pump, a valve body and an oil cylinder, and is characterized in that: 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, while the oil cylinder is also arranged in a horizontal state on the right side of the valve body. The oil pump is a gear pump and is connected to the oil cylinder through an oil channel opened in the valve body.

[0007] In a specific embodiment of the present invention, an oil pump cover flange matching cavity recessed in the left side surface of the valve body is provided at the central position on the left side of the valve body, a first oil inlet and return hole of the valve body, a second oil inlet and return hole of the valve body, an oil pump driving shaft pivot support hole and an oil pump driven shaft pivot support hole are provided in the oil pump cover flange matching cavity, the first oil inlet and return hole of the valve body and the second oil inlet and return hole of the valve body are respectively communicated with the oil cylinder through an oil passage provided in the valve body, the oil pump cooperates with the oil pump cover flange matching cavity and is also simultaneously connected with the oil pump driving shaft pivot support hole and the oil pump driven shaft pivot support hole. The swivel bearing hole is rotatably matched; a cylinder seat is formed in the central area on the right side of the valve body, and the cylinder seat is formed with a cylinder column sleeve matching cavity, in which a first oil inlet and return hole of the cylinder and a second oil inlet and return hole of the cylinder are provided, and a manual oil inlet hole, a pressure relief hole, an oil return hole and an oil suction hole are spaced apart on the right end surface of the cylinder seat of the cylinder seat, and the cylinder is matched with the cylinder column sleeve matching cavity in a lying state, and the first oil inlet and return hole of the cylinder, the second oil inlet and return hole of the cylinder, the manual oil inlet hole, the pressure relief hole, the oil return hole and the oil suction hole are each communicated with the cylinder through an oil channel opened in the valve body.

[0008] In another specific embodiment of the present invention, the oil pump is transmission-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 of the oil pump cover is formed in the right middle area of ​​the oil pump cover and at a position corresponding to the oil pump cover flange matching cavity, the oil pump cover flange is inserted into the oil pump cover flange matching cavity and forms a mutually compensating matching relationship with the oil pump cover flange matching cavity, 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, the left end of the oil pump driving shaft extends to the left side of the oil pump cover through the position of the oil pump driving shaft hole opened in the central position of the oil pump cover and is transmission-connected to the transition connection mechanism, and the right end of the oil pump driving shaft is rotatably supported on the oil pump driving shaft pivot. 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 to the oil pump driving shaft in the matching cavity of the oil pump cover flange, and the oil pump driven shaft gear is fixed to the oil pump driven shaft in the matching cavity of the oil pump cover flange and meshes with the oil pump driving shaft gear; a groove is provided on the bottom wall of the matching cavity of the oil pump cover flange. A pump cover flange sealing ring is arranged, and the right side surface of the oil pump cover flange is in sealing contact with the pump cover flange sealing ring; 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; 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.

[0009] 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 formed with 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 is inserted 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 at the transition The left end of the connecting sleeve is arranged in the outer protective box cavity, the motor fixing connecting seat is arranged on the right side of the outer protective box, and the motor fixing connecting seat is fixed to the left side of the oil pump cover by at least one pair of motor fixing connecting seat screws passing through the outer protective box screw holes opened on the outer protective box and then screwed into the pump cover screw holes opened on the oil pump cover, and a motor shaft passing hole of the motor fixing connecting seat is opened at the central position of the motor fixing connecting seat, which passes from the left side of the motor fixing connecting seat to the right side, and the motor shaft passing hole of the motor fixing connecting seat corresponds to the motor shaft fixing plate hole formed on the motor shaft fixing plate, and The motor shaft fixing plate hole is formed at the central position of the transition sleeve, and a motor shaft fixing plate shaft corresponding to the oil pump driving shaft insertion hole extends to the right from the central position of the right side of the motor shaft fixing plate; the motor shaft of the motor faces right, and the motor shaft passes through the motor shaft passing hole of the motor fixing connection seat and is inserted into the motor shaft fixing plate hole. It is fixed with the motor shaft fixing plate flat key at the position of the motor shaft fixing plate hole, and the motor is fixed to the left side of the motor fixing connection seat by the motor fixing screw; the left end of the oil pump driving shaft extends to the oil pump driving shaft insertion hole of the transition sleeve after passing through the driving shaft sealing sleeve. The right end of the motor shaft fixing disk shaft is inserted into the left end of the transition sleeve oil pump driving shaft insertion hole; the cross-sectional shape of the left end of the oil pump driving shaft and the cross-sectional shape of the motor shaft fixing disk shaft are both D-shaped, and the cross-sectional shape of the transition sleeve oil pump driving shaft insertion hole is also D-shaped, and 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 is matched with the motor shaft key matching groove; the motor is a DC motor with forward and reverse rotation functions.

[0010] In another 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 oil storage chamber is located at The cylinder column is located in the cylinder column sleeve so as to move left and right between the outer wall of the cylinder column sleeve and the inner wall of the cylinder outer sleeve. 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 first oil inlet and return hole of the cylinder and the second oil inlet and return hole of the cylinder are communicated with the left oil chamber; the manual oil inlet hole, pressure relief hole, oil return hole and oil suction hole are communicated with the oil storage chamber of the cylinder.

[0011] In another specific embodiment of the present invention, a manual oil return passage is longitudinally opened on the valve body, and the manual oil return passage is communicated with the manual oil inlet hole and the second oil inlet and return holes of the cylinder. In the manual oil return passage, there are arranged in sequence from bottom to top a manual oil return passage steel ball valve for communicating or blocking the manual oil inlet hole and the second oil inlet and return holes of the cylinder, a manual oil return passage sealing sleeve, and a manually operated oil return passage pressure regulating screw plug screwed into the threaded hole of the pressure regulating valve longitudinally opened on the upper part of the valve body, wherein the manual oil return passage sealing sleeve is sleeved on the manual oil return passage steel ball valve top rod extending from the lower end of the manual operation oil return passage pressure regulating screw plug, and the lower end face of the manual oil return passage steel ball valve top rod is in contact with the manual oil return passage steel ball valve.

[0012] In a further specific embodiment of the present invention, an oil suction hole connecting oil passage is longitudinally provided on the valve body, the first oil inlet and return holes of the valve body and the oil suction hole are communicated with the oil suction hole connecting oil passage, and an inlet and return oil circuit control valve hole is longitudinally provided above the oil suction hole connecting oil passage, and an oil suction hole check steel ball valve for connecting or blocking the first oil inlet and return holes of the valve body with the oil suction hole and an oil suction hole check steel ball valve stop rod corresponding to the top of the oil suction hole check steel ball valve are arranged in the inlet and return oil circuit control valve hole, and the oil suction hole check steel ball valve stop rod adjusting plug formed at the upper end of the oil suction hole check steel ball valve stop rod is threadedly matched with the hole wall of the oil suction hole check steel ball valve adjusting plug hole provided on the valve body.

[0013] In a further specific embodiment of the present invention, an oil inlet and return hole connecting oil passage is provided on the valve body, the second oil inlet and return hole of the valve body and the first oil inlet and return hole of the oil cylinder are communicated with the oil inlet and return hole connecting oil passage, and an oil inlet and return hole connecting oil passage plug, a check steel ball valve spring, a check steel ball valve, a valve core and a valve core stop rod are sequentially arranged from bottom to top at the position corresponding to the oil inlet and return hole connecting oil passage, the oil inlet and return hole connecting oil passage plug is threadedly fixed with a threaded matching hole of the oil inlet and return hole connecting plug provided at the bottom of the valve body, and the lower end of the check steel ball valve spring is supported on the upper end of the oil inlet and return hole connecting oil passage plug, The upper end of the check ball valve spring is configured as a free end and the check ball valve is supported on the upper end of the check ball valve spring. The valve core is arranged in the valve core vertical displacement cavity corresponding to the position above the check ball valve, and the valve core lower rod of the valve core is in contact with the check ball valve. The upper end face of the valve core upper rod of the valve core corresponds to the lower end face of the valve core stop rod. A valve core sealing ring is also provided on the valve core for forming a seal between the valve core and the cavity wall of the valve core vertical displacement cavity. The upper end of the valve core stop rod is configured with a valve core stop rod plug, which is threadedly matched with the valve core stop rod plug threaded hole opened at the top of the valve body.

[0014] In yet another specific embodiment of the present invention, a first oil return passage of the valve body, a second oil return passage of the valve body and a third oil return passage of the valve body are provided on the valve body, the first oil return passage of the valve body is communicated with the inlet and return oil circuit control valve hole and the inlet and return oil circuit connecting oil passage, and a first oil return passage oil plug is provided at an end of the first oil return passage away from the inlet and return oil circuit control valve hole, the first oil return passage oil plug is threadedly fixed to the first oil return passage oil plug threaded hole provided on the right side of the valve body, the second oil return passage of the valve body is connected to the The oil inlet and return hole connecting oil passage and the third oil return passage of the valve body are communicated, and the third oil return passage of the valve body is communicated with the oil return hole, wherein a third oil return passage oil plug threadedly connected to a third oil return passage oil plug threaded hole opened in the lower part of the valve body is provided at the lower end portion corresponding to the third oil return passage of the valve body, and a second oil return passage oil plug is provided at the end corresponding to the second oil return passage of the valve body away from the oil inlet and return hole connecting oil passage, and the second oil return passage oil plug is threadedly fixed to the second oil return passage oil plug threaded hole opened on the left side of the valve body.

[0015] In yet another specific embodiment of the present invention, a valve body pressure relief oil passage communicating with the pressure relief hole is provided on the valve body, the valve body pressure relief oil passage oil relief hole at the lower end of the valve body pressure relief oil passage is communicated with the second oil inlet and return hole of the valve body, and a pressure relief steel ball valve, a pressure relief steel ball valve spring, a support seat and a manual adjustment screw plug for opening or closing the passage between the valve body pressure relief oil passage and the pressure relief hole are sequentially arranged at the upper end of the valve body pressure relief oil passage from bottom to top, and the pressure relief steel ball valve is arranged between the oil inlet of the pressure relief hole and the pressure relief oil passage of the valve body pressure relief oil passage. Between the oil outlets, a support seat is arranged on the pressure relief steel ball valve, the lower end of the pressure relief steel ball valve spring is supported on the support seat, and the upper end is supported on the lower end of the manual adjusting screw plug, the upper end of the manual adjusting screw plug is threadedly connected with the threaded hole of the manual adjusting screw plug provided on the upper part of the valve body, wherein, a valve body pressure relief oil channel oil drain hole plug for sealing the end of the valve body pressure relief oil channel oil drain hole and threadedly connected with the threaded hole of the plug provided on the left side of the valve body is provided at a position corresponding to the end of the valve body pressure relief oil channel oil drain hole.

[0016] The technical effect of the technical solution provided by the present invention is that: since the oil tank and / or reduction box are abandoned and a transmission relationship of direct connection is formed between the motor and the oil pump, the structure is significantly simplified and the volume is reduced; since the motor and the oil pump are arranged on the same side of the valve body, and the oil cylinder is arranged on the other side of the valve body, the space is optimized and the components and weight are reasonably distributed relative to the valve body, which is beneficial to maintenance on the one hand, and can reduce the flow resistance of the hydraulic oil as a fluid on the other hand, and can ensure the reliability of installation and the safety of use on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an assembly structure diagram of the present invention; Figure 2 for Figure 1 A cross-sectional view of the oil pump, valve body and oil cylinder shown; Figure 3 for Figure 1 and Figure 2 The structural diagram of the valve body shown; Figure 4 for Figure 1 and Figure 3 A schematic diagram of the valve body as viewed from the right side shown; Figure 5 For the establishment of Figures 1 to 4 A schematic diagram showing the oil suction hole on the valve body connected to the oil passage; Figure 6 For the establishment of Figures 1 to 5 Schematic diagram of the manual oil return passage on the valve body shown; Figure 7 For the establishment of Figures 1 to 6 The schematic diagram of the oil inlet and return holes on the valve body connected to the oil passage is shown; Figure 8 For the establishment of Figures 1 to 7 A schematic diagram of the first, second and third oil return passages of the valve body shown in the figure; Fig. 9 For the establishment of Figures 1 to 8 A schematic diagram of a valve body pressure relief oil passage on a valve body shown; Fig.10 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 Figure 1 The current position state is used 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 "base", the same below) and an oil cylinder 4, as the technical highlights of the technical solution provided by the present invention: the aforementioned motor 1 is transmission-connected to 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, while the aforementioned oil cylinder 4 is also arranged in a horizontal state on the right side of the valve body 3, the aforementioned oil pump 2 is a gear pump and is communicated with the aforementioned oil cylinder 4 through an oil passage opened in the valve body 3.

[0021] See also Figure 3 , Figure 4 And combined with Figure 1In the central position of the left side of the aforementioned valve body 3, there is a pump cover flange matching cavity 31 which is recessed in the left side surface of the valve body 3. In the pump cover flange matching cavity 31, there are a first oil inlet and return hole 311 of the valve body, a second oil inlet and return hole 312 of the valve body, a pump driving shaft pivot support hole 313 and a pump driven shaft pivot support hole 314. The first oil inlet and return hole 311 of the valve body and the second oil inlet and return hole 312 of the valve body are respectively communicated with the aforementioned oil cylinder 4 through the oil passages provided in the valve body 3. The aforementioned oil pump 2 is matched with the pump cover flange matching cavity 31 and is also rotationally matched with the aforementioned oil pump driving shaft pivot support hole 313 and the oil pump driven shaft pivot support hole 314. In the central area on the right side of the aforementioned valve body 3, there is formed There is a cylinder seat 32, which is formed with a cylinder sleeve matching cavity 321, in which a first cylinder oil inlet and return hole 3211 and a second cylinder oil inlet and return hole 3212 are provided, and on the right end surface 322 of the cylinder seat 32, a manual oil inlet hole 3221, a pressure relief hole 3222, an oil return hole 3223 and an oil suction hole 3224 are spaced apart. The aforementioned cylinder 4 is matched with the aforementioned cylinder sleeve matching cavity 321 in a lying state, and the aforementioned first cylinder oil inlet and return hole 3211, the second cylinder oil inlet and return hole 3212, the manual oil inlet hole 3221, the pressure relief hole 3222, the oil return hole 3223 and the oil suction hole 3224 are each connected with the aforementioned cylinder 4 through an oil channel provided in the valve body 3.

[0022] Please see the key Figure 1The 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. 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. In the right middle area of ​​the oil pump cover 21 and at a position corresponding to the aforementioned oil pump cover flange matching cavity 31, an oil pump cover flange 211 protruding from the right side of the oil pump cover 21 is formed. The oil pump cover flange 211 is inserted into the oil pump cover flange matching cavity 31 to form a mutually compensating matching relationship with the oil pump cover flange matching cavity 31, and a group of oil pump cover fixing screws 212 distributed at intervals fix the oil pump cover 21 with 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. 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 in the central position of the oil pump cover 21 and is transmission-connected with 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 oil pump cover flange matching cavity 31, and the oil pump driven shaft gear 25 is fixed to the aforementioned oil pump driven shaft 23 in the aforementioned oil pump cover flange matching cavity 31 and meshes with the oil pump driving shaft gear 24.

[0023] Depend on Figure 1 As shown, a pump cover flange sealing ring 316 is provided on the bottom wall of the aforementioned oil pump cover flange matching cavity 31, and the right side surface of the aforementioned oil pump cover flange 211 is in sealing contact with the pump cover flange sealing ring 316; an active shaft sealing sleeve hole 215 with a diameter larger than the diameter of the oil pump active shaft hole 213 is provided 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.

[0024] See you next time Figure 1A pair of (but also three or four equally spaced) pump cover screw holes 216 are provided on the aforementioned oil pump cover 21; the aforementioned transition connection mechanism 5 comprises an outer protective box 51 (also referred to as an "outer protective sleeve"), 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, 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 The transfer hole 512 has a left end that extends into the outer casing cavity 511, and a right end that extends to the right side of the aforementioned cavity bottom wall. 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 connection 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 connected to the oil pump cover 21 by at least one pair (a pair in this embodiment) of motor fixing connection seat screws 542 that pass through the outer casing screw holes 513 opened on the outer casing 51 and then screw into the aforementioned pump cover screw holes 216 opened on the aforementioned oil pump cover 21. The motor fixing connection seat 54 is fixed on the left side, and a motor fixing connection seat motor shaft through hole 541 is provided at the central position of the motor fixing connection seat 54, which passes from the left side of the motor fixing connection seat 54 to the right side. The motor fixing connection seat motor shaft through hole 541 corresponds to the motor shaft fixing plate hole 531 formed on the motor shaft fixing plate 53, and the motor shaft fixing plate hole 531 is formed at the central position of the transition connection sleeve 52, and a motor shaft fixing plate shaft 532 corresponding to the oil pump driving shaft insertion hole 521 is extended to the right from the central position of the right side surface of the aforementioned motor shaft fixing plate 53; the aforementioned motor 1 The motor shaft 11 faces rightward, and the motor shaft 11 passes through the motor shaft through hole 541 of the motor fixing connection seat and is inserted into the motor shaft fixing plate hole 531 and is fixed with the motor shaft fixing plate 53 at the position of the motor shaft fixing plate hole 531. 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 transition connection sleeve oil pump driving shaft exploration hole 521 after passing through the aforementioned driving shaft sealing sleeve 2151, and the aforementioned motor shaft fixing plate shaft 532 is inserted into the left end of the transition connection sleeve oil pump driving shaft exploration hole 521.

[0025] Preferably, 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 532 are both D-shaped, and the cross-sectional shape of the aforementioned transition connecting sleeve oil pump driving shaft insertion hole 521 is also D-shaped, and a motor shaft key matching groove 5311 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 5311, and the motor shaft key is matched with the motor shaft key matching groove 5311; the aforementioned motor 1 is a DC motor with forward and reverse rotation functions.

[0026] See also Figure 2 And combined with Figure 1 , Figure 3 and Figure 4 A cylinder sleeve fitting groove 323 is provided on the right side surface of the aforementioned cylinder seat 32 formed in the central area on the right side of the aforementioned 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 aforementioned cylinder sleeve fitting groove 323. The left end of the cylinder column sleeve 42 is fitted with the aforementioned 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 inner wall of the cylinder sleeve 41. The cylinder column 44 is movably located left and right in the cylinder column sleeve 42, and a cylinder column piston 441 is provided at the left end of the cylinder column 44, 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; the aforementioned cylinder first oil inlet and return hole 3211 and the cylinder second oil inlet and return hole 3212 are communicated with the aforementioned left oil chamber 451; the aforementioned manual oil inlet hole 3221, the pressure relief hole 3222, the oil return hole 3223 and the oil suction hole 3224 are communicated with the aforementioned cylinder oil storage chamber 43.

[0027] When the motor 1 works clockwise, the motor shaft 11 drives the motor shaft fixing plate 53 and then drives the transition sleeve 52. At the same time, the transition sleeve 52 drives the oil pump driving shaft 22 to rotate clockwise accordingly, and the oil pump driving shaft 22 drives the oil pump driving shaft gear 24. Since the oil pump driven shaft gear 25 is meshed with the oil pump driving shaft gear 24, the oil pump driven shaft gear 24 drives the oil pump driven shaft gear 25 under the rotation of the oil pump driving shaft 22. In this state, the oil is led to the oil pump cover flange matching cavity 31 through the first oil inlet and return hole 311 of the valve body, and then led out from the second oil inlet and return hole 312 of the valve body, and vice versa. That is to say, when the motor works counterclockwise, the oil inlet and return process is opposite to the above, that is, the oil pumping mode or working mode of the oil pump 2 is adapted to the forward and reverse working state of the motor 1.

[0028] See also Figure 6A manual oil return passage 33 is longitudinally opened on the aforementioned valve body 3, and the manual oil return passage 33 is communicated with the aforementioned manual oil inlet hole 3221 and the aforementioned second oil inlet and return hole 3212 of the cylinder. A manual oil return passage steel ball valve 331 for communicating or blocking the manual oil inlet hole 3221 with the second oil inlet and return hole 3212 of the cylinder, a manual oil return passage sealing sleeve 332 and a manual operation oil return passage pressure regulating screw plug 34b screwed into the pressure regulating valve threaded hole 34a longitudinally opened on the upper part of the aforementioned valve body 3 are arranged in sequence from bottom to top in the manual oil return passage 33, wherein the aforementioned manual oil return passage sealing sleeve 332 is sleeved on the manual oil return passage steel ball valve push rod 34c extending from the lower end of the manual operation oil return passage pressure regulating screw plug 34b, and the lower end face of the manual oil return passage steel ball valve push rod 34c is in contact with the manual oil return passage steel ball valve 331.

[0029] See also Figure 5 An oil suction hole connecting oil passage 35 is longitudinally opened on the aforementioned valve body 3, the aforementioned first oil inlet and return hole 311 of the valve body and the aforementioned oil suction hole 3224 are connected to the oil suction hole connecting oil passage 35, and an oil inlet and return oil circuit control valve hole 351 is longitudinally opened above the oil suction hole connecting oil passage 35, and an oil suction hole check steel ball valve 3511 for connecting or blocking the aforementioned first oil inlet and return hole 311 of the valve body with the aforementioned oil suction hole 3224 and an oil suction hole check steel ball valve stop rod 3512 corresponding to the upper part of the oil suction hole check steel ball valve 3511 are arranged in the oil inlet and return oil circuit control valve hole 351, and the oil suction hole check steel ball valve stop rod 3512 is formed at the upper end of the oil suction hole check steel ball valve stop rod 3512 and is threadedly matched with the hole wall of the oil suction hole check steel ball valve adjustment plug hole 34d opened on the valve body 3.

[0030] See also Figure 7, an oil inlet and return hole connecting oil passage 36 is provided on the aforementioned valve body 3, the aforementioned second oil inlet and return hole 312 of the valve body and the aforementioned first oil inlet and return hole 3211 of the oil cylinder are communicated with the oil inlet and return hole connecting oil passage 36, and an oil inlet and return hole connecting oil passage plug 361, a check ball valve spring 362, a check ball valve 363, a valve core 364 and a valve core retaining rod 365 are sequentially arranged from bottom to top at the position corresponding to the oil inlet and return hole connecting oil passage 36, the oil inlet and return hole connecting oil passage plug 361 is threadedly fixed to the oil inlet and return hole connecting oil passage plug threaded matching hole 34e provided at the bottom of the valve body 3, the lower end of the check ball valve spring 362 is supported on the upper end of the oil inlet and return hole connecting oil passage plug 361, and the upper end of the check ball valve spring 362 is configured as a free end The check ball valve 363 is supported on the upper end of the check ball valve spring 362, and the valve core 364 is arranged in the valve core vertical displacement chamber 366 corresponding to the position above the check ball valve 363, and the valve core lower rod 3641 of the valve core 364 is in contact with the check ball valve 363, and the upper end face of the valve core upper rod 3642 of the valve core 364 corresponds to the lower end face of the valve core stop rod 365, and a valve core sealing ring 3643 is also provided on the valve core 364 for forming a seal between the valve core 364 and the cavity wall of the valve core vertical displacement chamber 366, and the upper end of the valve core stop rod 365 is formed with a valve core stop rod plug 3651, and the valve core stop rod plug 3651 is threadedly matched with the valve core stop rod plug threaded hole 34f opened at the top of the valve body 3.

[0031] See also Figure 8 A first oil return passage 37a, a second oil return passage 37b and a third oil return passage 37c are provided on the valve body 3. The first oil return passage 37a of the valve body is communicated with the aforementioned oil inlet and return control valve hole 351 and the aforementioned oil inlet and return hole connecting oil passage 36. A first oil return passage oil plug 37d is provided at an end of the first oil return passage 37a away from the oil inlet and return control valve hole 351. The first oil return passage oil plug 37d is threadedly fixed to the first oil return passage oil plug threaded hole 34g provided on the right side of the valve body 3. The second oil return passage 37b of the valve body is connected to the aforementioned oil inlet and return hole connecting oil passage 36. 36 and the third oil return passage 37c of the valve body, and the third oil return passage 37c of the valve body is communicated with the aforementioned oil return hole 3223, wherein a third oil return passage oil plug 37f is threadedly connected to the third oil return passage oil plug threaded hole 34j opened in the lower part of the valve body 3 at the lower end portion corresponding to the aforementioned valve body third oil return passage 37c, and a second oil return passage oil plug 37e is provided at the end corresponding to the second oil return passage 37b of the valve body away from the aforementioned oil inlet return hole connecting oil passage 36, and the second oil return passage oil plug 37e is threadedly fixed to the second oil return passage oil plug threaded hole 34h opened on the left side of the valve body 3.

[0032] See also Fig. 9A valve body pressure relief oil passage 38 communicating with the pressure relief hole 3222 is provided on the valve body 3. The valve body pressure relief oil passage oil leakage hole 381 at the lower end of the valve body pressure relief oil passage 38 communicates with the second oil inlet and return hole 312 of the valve body. A pressure relief steel ball valve 382, ​​a support seat 384, a pressure relief steel ball valve spring 383 and a manual adjustment screw plug 385 for opening or closing the passage between the valve body pressure relief oil passage 38 and the pressure relief hole 3222 are sequentially arranged at the upper end of the valve body pressure relief oil passage 38 from bottom to top. The pressure relief steel ball valve 382 is arranged between the oil inlet of the pressure relief hole 3222 and the oil outlet of the pressure relief oil passage of the valve body pressure relief oil passage 38. In the embodiment, a support seat 384 is arranged on the pressure relief steel ball valve 382, ​​the lower end of the pressure relief steel ball valve spring 383 is supported on the support seat 384, and the upper end is supported on the lower end of the manual adjusting screw plug 385, the upper end of the manual adjusting screw plug 385 is threadedly connected with the manual adjusting screw plug mating threaded hole 34i opened on the upper part of the valve body 3, wherein, a valve body pressure relief oil channel drain hole plug 386 is provided at a position corresponding to the end of the valve body pressure relief oil channel drain hole 381 for sealing the end of the valve body pressure relief oil channel drain hole 381 and is threadedly connected with the plug mating threaded hole 34k opened on the left side of the aforementioned valve body 3.

[0033] See also Fig.10 ,exist Fig.10 A pair of wall panels 61 of the structural system of the jack 6 belonging to the category of a lifting device (also called a jacking device) are shown, and a travel wheel 62 is provided at the left and right ends of the pair of wall panels 61 through a travel wheel shaft 621, and a lifting arm 63 is hinged between the pair of wall panels 61 through a lifting arm hinge shaft 631 and the left end of a connecting rod 64 is hinged between the pair of wall panels 61 through a connecting rod hinge shaft 641, and the right end of the connecting rod 64 is hinged to the right end of the cylinder column 44 of the structural system of the aforementioned cylinder 4 through a cylinder column hinge pin 642. The right end of the aforementioned lifting arm 63 is configured as a free end that can be raised upward or reset downward and is hinged to a tray 65 through a tray hinge pin 651, and the tray 65 can also be called a tray, which is used to lift heavy objects such as vehicle chassis, etc. 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, since the connecting rod 64 is hinged to the right end of the cylinder column 44 through the connecting rod hinge shaft 641, the cylinder column 44 pushes the connecting rod 64, and the connecting rod 64 pulls the lifting arm 63, so that the right end of the lifting arm 63 together with the tray 65 is lifted upward, and vice versa.

[0034] The applicant 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.

[0035] Applicant combination Figures 1 to 10 Briefly describe the working process of the present invention. First, take the example of oil filling until the lifting arm 63 and the tray 65 are lifted. The motor 1 works clockwise, so that the motor shaft 11 rotates clockwise and drives the motor shaft fixing plate 53 and the transition sleeve 52. The transition sleeve 52 drives the oil pump driving shaft 22 and its oil pump driving shaft gear 24. The oil pump driving shaft gear 24 drives the oil pump driven shaft gear 25 meshed with it and arranged on the oil pump driven shaft 23. Under the rotation of the above-mentioned oil pump main and driven shaft gears 24 and 25, the oil pump driven shaft gear 25 is driven by the oil pump driven shaft gear 25. Figure 5 , Figure 7 The oil suction hole 3224 shown in the figure sucks oil from the oil storage chamber 43 of the oil cylinder 4, and the oil sucked out from the oil storage chamber 43 passes through the Figure 5 The oil suction hole connecting oil passage 35 shown in the figure enters the oil inlet and return oil circuit control valve hole 351 in the state of pushing open the oil suction hole check steel ball valve 3511, and then enters the oil pump cover flange matching cavity 31 (i.e., the oil pump cavity) through the first oil inlet and return oil hole 311 of the valve body. The oil entering the oil pump cover flange matching cavity 31, i.e., the oil entering the oil pump cavity, enters through the second oil inlet and return oil hole 312 of the valve body. Figure 7 The oil inlet and return hole connecting oil passage 36 shown in the figure is specifically caused by the pressure oil entering the valve stem 3641 under the valve core to act on the same Figure 7 The check ball valve 363 shown in the figure is subjected to the oil pressure to compress the check ball valve spring 362 located below it. At this time, the oil from the first oil inlet and return hole 311 of the valve body can enter the first oil inlet and return hole 3211 of the oil cylinder and enter the pressure oil chamber 45. In the above process, the oil cylinder column 44 extends out of the oil cylinder column sleeve 42, that is, the oil cylinder column 44 extends to the right.

[0036] The oil return process is: the motor 1 works in the reverse direction relative to the aforementioned working state, that is, counterclockwise, from the same form as above (only the rotation direction is opposite) until the aforementioned oil pump main and driven shaft gears 24 and 25 rotate in the opposite direction relative to the aforementioned oil inlet process, Figure 7 and Figure 8 As shown, the oil is sucked from the second oil inlet and return hole 312 of the valve body, and the sucked oil enters the above-mentioned oil pump cover flange matching cavity 31 (that is, enters the oil pump cavity), and then enters the oil inlet and return circuit control valve hole 351 through the first oil inlet and return hole 311 of the valve body in a process basically similar to the above, and then passes through the first oil return passage 37a of the valve body and the top of the valve core 364 in turn. The valve core 364 moves downward to open the check ball valve 363, and the oil passes through the first oil inlet and return hole of the oil cylinder in turn. 3211, the oil inlet and return holes connecting the oil passage 36, the second oil inlet and return holes 312 of the valve body, the oil pump cover flange matching cavity 31, the first oil inlet and return holes 311 of the valve body, the oil inlet and return circuit control valve hole 351, the first oil return passage 37a of the valve body, the second oil return passage 37b of the valve body and the third oil return passage 37c of the valve body, and finally return to the oil cylinder storage chamber 43 from the oil return hole 3223, and the cylinder column 44 recovers, that is, the cylinder column 44 moves left and returns to the cylinder column sleeve 42.

[0037] The operation of manual oil return is as follows: Figure 6 , turn the manually operated oil return channel pressure regulating screw plug 34b, release the manual oil return channel ball valve 331, open the channel between the second oil inlet and return hole 3212 of the oil cylinder and the manual oil inlet hole 3221, and the pressure oil enters the oil cylinder oil storage chamber 43 through the second oil inlet and return hole 3212 of the oil cylinder, the manual oil return channel 33, and the manual oil inlet hole 3221.

[0038] Depend on Figure 7 and Fig. 9 As shown, Fig. 9 The figure shows the automatic pressure relief process. During the lifting process of the jack, if the pressure is too high, that is, the pressure exceeds the pressure set by the manual adjusting screw plug 385 serving as the pressure regulating valve, then the oil (high-pressure oil) in the second oil inlet and return hole 312 of the valve body passes through the valve body pressure relief oil channel oil leakage hole 381, the valve body pressure relief oil channel 38, pushes open the pressure relief steel ball valve 382, ​​and then returns to the cylinder oil storage chamber 43 through the pressure relief hole 3222.

[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 electric hydraulic device for a jack, comprising a motor (1), an oil pump (2), a valve body (3) and an oil cylinder (4), characterized in that: The motor (1) is transmission-connected to the oil pump (2), and the oil pump (2) and the motor (1) are disposed in a horizontal position on the left side of the valve body (3), while the oil cylinder (4) is also disposed in a horizontal position on the right side of the valve body (3). The oil pump (2) is a gear pump and is connected to the oil cylinder (4) via an oil passage opened in the valve body (3).

2. The electric hydraulic device of a jack according to claim 1, characterized in that: A pump cover flange mating cavity (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 first valve body oil inlet and return hole (311), a second valve body oil inlet and return 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 cover flange mating cavity (31). The first valve body oil inlet and return hole (311) and the second valve body oil inlet and return hole (312) are connected to the oil cylinder (4) through an oil passage provided in the valve body (3). The oil pump (2) is mated with the pump cover flange mating cavity (31) and is also rotatably mated with the oil pump driving shaft pivot support hole (313) and the oil pump driven shaft pivot support hole (314). A cylinder seat is formed in the central area on the right side of the valve body (3). (32), the oil cylinder seat (32) is formed with an oil cylinder column sleeve matching cavity (321), a first oil cylinder oil inlet and return hole (3211) and a second oil cylinder oil inlet and return hole (3212) are provided in the oil cylinder column sleeve matching cavity (321), and a manual oil inlet hole (3221), a pressure relief hole (3222), an oil return hole (3223) and a suction hole (3224) are provided on the right end surface (322) of the oil cylinder seat (32) at intervals. The oil cylinder (4) is matched with the matching cavity (321) of the oil cylinder column sleeve in a horizontal state, and the first oil inlet and return hole (3211) of the oil cylinder, the second oil inlet and return hole (3212) of the oil cylinder, the manual oil inlet hole (3221), the pressure relief hole (3222), the oil return hole (3223) and the oil suction hole (3224) of the oil cylinder are each connected with the oil cylinder (4) through an oil passage opened in the valve body (3).

3. The electric hydraulic device of a jack 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 of ​​the right side of the oil pump cover (21) and at a position corresponding to the oil pump cover flange matching cavity (31). The oil pump cover flange (211) is inserted into the oil pump cover flange matching cavity (31) to match the oil pump. The pump cover flange mating cavity (31) forms a mutually compensating mating relationship, and a group of oil pump cover fixing screws (212) are spaced apart 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). 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 with the transition connection mechanism (5), while the right end of the oil pump driving shaft (22) is rotatably supported in the oil pump driving shaft pivot support hole (313), and the oil pump driven shaft The left end of the oil pump (23) is rotatably supported in the oil pump driven shaft support hole (214) provided 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 oil pump cover flange matching cavity (31), and the oil pump driven shaft gear (25) is fixed to the oil pump driven shaft (23) in the oil pump cover flange matching cavity (31) and meshes with the oil pump driving shaft gear (24); a pump cover flange sealing ring (31) is provided on the bottom wall of the oil pump cover flange matching cavity (31). 6), the right side surface of the oil pump cover flange (211) is in sealing contact with the pump cover flange sealing ring (316); a driving shaft sealing sleeve hole (215) having a diameter greater than the diameter of the oil pump driving shaft hole (213) is provided at the central position of the oil pump cover (21) and at a position corresponding to the oil pump driving shaft hole (213), a main shaft sealing sleeve (2151) is embedded in the driving shaft sealing sleeve hole (215), and 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 connection mechanism (5).

4. The electric hydraulic device of a jack 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 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 opening on the left side; a transition connection sleeve pivoting position hole (512) is provided on the right side bottom wall of the outer protective box 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 extends into the outer protective box cavity (511). 511), and the right end extends to the right side of the cavity bottom wall, 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) provided on the outer casing (51) and then screwed into the pump cover screw holes (216) provided on the oil pump cover (21), and the motor fixing connection seat (54) A motor shaft through hole (541) of the motor fixing connection seat is provided at the central position thereof and passes through from the left side of the motor fixing connection seat to the right side thereof. The motor shaft through hole (541) of the motor fixing connection seat corresponds to a motor shaft fixing plate hole (531) formed on the motor shaft fixing plate (53). The motor shaft fixing plate hole (531) is formed at the central position of the transition sleeve (52). A motor shaft fixing plate shaft (532) corresponding to the oil pump driving shaft insertion hole (521) is extended to the right at the central position of the right side surface of the motor shaft fixing plate (53). The motor shaft (11) of the motor (1) faces rightward. The motor shaft (11) passes through the motor shaft through hole (541) of the motor fixing connection seat and is inserted into the motor shaft fixing plate hole (531) and is fixed with the motor shaft fixing plate (53) by a flat key at the position of the motor shaft fixing plate hole (531). 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) extends to the right end of the oil pump driving shaft insertion hole (521) of the transition connection sleeve after passing through the driving shaft sealing sleeve (2151), and the motor shaft fixing plate shaft (532) is inserted into the left end of the oil pump driving shaft insertion hole (521) of the transition connection sleeve;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 (532) are both D-shaped, and the cross-sectional shape of the transition connecting sleeve oil pump driving shaft insertion hole (521) is also D-shaped. A motor shaft key matching groove (5311) 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 (5311), and the motor shaft key matches the motor shaft key matching groove (5311); the motor (1) is a DC motor with forward and reverse rotation functions. ; 5. The electric hydraulic device of a jack 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 is recessed in the right side surface of the cylinder seat (32) in the circumferential direction around 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 inner wall of the cylinder sleeve (41). The oil cylinder column (44) is movably located in the oil cylinder column sleeve (42) left and right. A oil cylinder column piston (441) is provided at the left end of the oil cylinder column (44). 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 first oil inlet and return hole (3211) and the second oil inlet and return hole (3212) of the oil cylinder are in communication with the left oil chamber (451); the manual oil inlet hole (3221), the pressure relief hole (3222), the oil return hole (3223) and the oil suction hole (3224) are in communication with the oil storage chamber (43) of the oil cylinder.

6. The electric hydraulic device of a jack according to claim 5, characterized in that: A manual oil return passage (33) is longitudinally provided on the valve body (3), the manual oil return passage (33) being in communication with the manual oil inlet hole (3221) and the second oil inlet and return hole (3212) of the oil cylinder, and a manual oil return passage steel ball valve (331) and a manual oil return passage sealing sleeve (332) are sequentially provided in the manual oil return passage (33) from bottom to top for connecting or blocking the manual oil inlet hole (3221) and the second oil inlet and return hole (3212) of the oil cylinder. And a manually operated oil return channel pressure regulating screw plug (34b) screwed into a pressure regulating valve threaded hole (34a) longitudinally opened on the upper part of the valve body (3), wherein the manual oil return channel sealing sleeve (332) is sleeved on a manual oil return channel steel ball valve push rod (34c) extending from the lower end of the manually operated oil return channel pressure regulating screw plug (34b), and the lower end surface of the manual oil return channel steel ball valve push rod (34c) is in contact with the manual oil return channel steel ball valve (331).

7. The electric hydraulic device of a jack according to claim 2, characterized in that: An oil suction hole connecting oil passage (35) is longitudinally provided on the valve body (3); the first oil inlet and return hole (311) of the valve body and the oil suction hole (3224) are in communication with the oil suction hole connecting oil passage (35); an oil inlet and return circuit control valve hole (351) is longitudinally provided above the oil suction hole connecting oil passage (35); a valve for controlling the oil inlet and return circuit (351) is provided in the oil inlet and return circuit control valve hole (351) for controlling the oil inlet and return circuit (351) of the valve body. An oil suction hole check steel ball valve (3511) connected to or blocked by the oil suction hole (3224) and an oil suction hole check steel ball valve stop rod (3512) corresponding to the upper part of the oil suction hole check steel ball valve (3511), an oil suction hole check steel ball valve stop rod adjusting plug (35121) formed at the upper end of the oil suction hole check steel ball valve stop rod (3512) and threadedly matched with the hole wall of the oil suction hole check steel ball valve adjusting plug hole (34d) opened on the valve body (3).

8. The electric hydraulic device of a jack according to claim 7, characterized in that: An oil inlet and return hole connecting oil passage (36) is provided on the valve body (3); the second oil inlet and return hole (312) of the valve body and the first oil inlet and return hole (3211) of the oil cylinder are in communication with the oil inlet and return hole connecting oil passage (36); an oil inlet and return hole connecting oil passage plug (361), a check steel ball valve spring (362), a check steel ball valve (363), a valve core (364) and a valve core stop rod (365) are provided in sequence from bottom to top at a position corresponding to the oil inlet and return hole connecting oil passage (36); the oil inlet and return hole connecting oil passage plug (361) is threadedly fixed to a threaded matching hole (34e) of the oil inlet and return hole connecting oil passage plug provided at the bottom of the valve body (3); the lower end of the check steel ball valve spring (362) is supported on the upper end of the oil inlet and return hole connecting oil passage plug (361), and the upper end of the check steel ball valve spring (362) is configured as a free end and a check steel ball valve spring (363) is provided. The steel ball valve (363) is supported on the upper end of the check steel ball valve spring (362), the valve core (364) is arranged in the valve core upper and lower displacement chamber (366) corresponding to the position above the check steel ball valve (363), and the valve core lower rod (3641) of the valve core (364) contacts the check steel ball valve (363), and the upper end surface of the valve core upper rod (3642) of the valve core (364) corresponds to the valve core stop rod (366). The valve core (364) is provided with a valve core sealing ring (3643) for sealing the valve core (364) with the wall of the valve core vertical displacement chamber (366), and the upper end of the valve core stop rod (365) is formed with a valve core stop rod plug (3651), and the valve core stop rod plug (3651) is threadedly matched with the valve core stop rod plug threaded hole (34f) provided at the top of the valve body (3).

9. The electric hydraulic device of a jack according to claim 8, characterized in that: The valve body (3) is provided with a first oil return passage (37a), a second oil return passage (37b) and a third oil return passage (37c). The first oil return passage (37a) is communicated with the oil inlet and return control valve hole (351) and the oil inlet and return hole connecting passage (36). A first oil return passage oil plug (37d) is provided at an end of the first oil return passage (37a) away from the oil inlet and return control valve hole (351). The first oil return passage oil plug (37d) is threadedly fixed to the first oil return passage oil plug threaded hole (34g) provided on the right side of the valve body (3). The second oil return passage (37b) is connected to the oil inlet and return hole connecting passage (36). 36) and the third oil return passage (37c) of the valve body, and the third oil return passage (37c) of the valve body is communicated with the oil return hole (3223), wherein a third oil return passage oil plug (37f) threadedly connected to a third oil return passage oil plug threaded hole (34j) opened in the lower part of the valve body (3) is provided at the lower end portion corresponding to the third oil return passage (37c) of the valve body, and a second oil return passage oil plug (37e) is provided at one end corresponding to the second oil return passage (37b) of the valve body away from the oil inlet and return hole connecting oil passage (36), and the second oil return passage oil plug (37e) is threadedly fixed to the second oil return passage oil plug threaded hole (34h) opened on the left side of the valve body (3).

10. The electric hydraulic device of a jack according to claim 5, characterized in that: The valve body (3) is provided with a valve body pressure relief oil passage (38) which is in communication with the pressure relief hole (3222); the valve body pressure relief oil passage oil leakage hole (381) at the lower end of the valve body pressure relief oil passage (38) is in communication with the second oil inlet and return hole (312) of the valve body; a pressure relief steel ball valve (382) for opening or closing the passage between the valve body pressure relief oil passage (38) and the pressure relief hole (3222), a pressure relief steel ball valve spring (383), a support seat (384) and a manual adjustment screw plug (385) are sequentially arranged at the upper end of the valve body pressure relief oil passage (38) from bottom to top; the pressure relief steel ball valve (382) is arranged between the oil inlet of the pressure relief hole (3222) and the oil outlet of the pressure relief oil passage of the valve body pressure relief oil passage (38). The support seat (384) is arranged on the pressure relief steel ball valve (382) between the openings, the lower end of the pressure relief steel ball valve spring (383) is supported on the support seat (384), and the upper end is supported on the lower end of the manual adjustment screw plug (385), the upper end of the manual adjustment screw plug (385) is threadedly connected with the manual adjustment screw plug matching threaded hole (34i) opened on the upper part of the valve body (3), wherein a valve body pressure relief oil channel oil drain hole plug (386) is provided at a position corresponding to the end of the valve body pressure relief oil channel oil drain hole (381) for sealing the end of the valve body pressure relief oil channel oil drain hole (381) and is threadedly connected with the plug matching threaded hole (34k) opened on the left side of the valve body (3).

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