Hydraulic device of manual-automatic integrated jack

Abstract

The utility model discloses a hydraulic device of a manual-automatic integrated jack, and belongs to the technical field of hoisting facilities. Which comprises a motor, an oil pump, a valve body, an oil cylinder and a manual oil pumping and oil returning operation mechanism, and is characterized in that the motor is in transmission connection with the oil pump, the oil pump and the motor are arranged on the right side of the valve body in a horizontal state, and the manual oil pumping and oil returning operation mechanism is arranged on the right side of the valve body along with the oil pump. The oil cylinder is horizontally arranged on the left side of the valve body, the oil pump is a gear pump and is communicated with the oil cylinder through an oil channel formed in the valve body, and the manual oil pumping and oil returning operation mechanism is also communicated with the oil cylinder through an oil channel formed in the valve body. The structure is simplified, and the size is reduced. Resources are saved, and management and protection are convenient; space is optimized, so that components and weight are reasonably distributed relative to the valve body, maintenance is facilitated, flow resistance of hydraulic oil serving as fluid is reduced, and installation reliability and use safety are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of lifting equipment technology, specifically relating to a hydraulic device for a manual / automatic integrated jack. Background Technology

[0002] The aforementioned concept of a manual-automatic jack refers to a hydraulic device that can operate both manually and automatically, meaning it combines both manual and automatic functions.

[0003] As can be seen from the above, a single jack can be driven manually or automatically. In manual mode, the liquid (oil) pressure transmission is as follows: pulling down the handle injects hydraulic oil into the pump piston, utilizing the incompressibility of the hydraulic oil to apply uniform pressure to the cylinder, pushing the piston (also known as the "large piston") upward to achieve lifting; oil suction and discharge are achieved by: lifting the handle to create a vacuum, allowing oil in the cylinder's reservoir or tank to flow in through a one-way valve; pressing down the handle pushes the high-pressure oil to the main working chamber, driving the piston upward to complete the oil suction and discharge cycle; release and descent are achieved by: opening the drain port or rotating the control lever to disconnect the oil circuit, allowing the high-pressure liquid medium to flow back to the cylinder's reservoir or tank, reducing the system pressure and allowing the load to descend smoothly. For the specific working principle of the automatic mode, please refer to the patent documents in the prior art mentioned below by the applicant.

[0004] Publicly available Chinese patent documents contain technical information related to hydraulic jacks falling under the aforementioned category of automatic structural modes. For example, CN102530767B recommends an "oil pump device for an electric hydraulic jack with an integrated valve body." This device places the oil pump directly within an oil tank made of elastic material, shaped like a U-shaped plate tilted 90° to the left. The top body of the hydraulic lifting device is longitudinally positioned corresponding to the aforementioned U-shaped space and perpendicular to the horizontally positioned motor. Because this patent requires an oil tank and establishes an oil circuit between the oil tank, oil pump, and hydraulic lifting device, while it possesses the advantages described in paragraph 0017 of its specification—namely, a reasonable reduction in size and a lower risk of oil leakage—its manufacturing and assembly are relatively cumbersome, complicating the overall structure. Furthermore, due to the need for an independent oil tank, it does not truly achieve the effect of a small size. For example, CN202274265U provides a "multi-functional manual jack for vehicles." This patent has the advantage of integrating the dual functions of an air pump and an oil pump into one unit. However, it also uses a single-row oil tank, similar in structure to that mentioned in CN102530767B, and moves the oil pump outside the tank. Therefore, it also suffers from the shortcomings of CN102530767B to some extent. Furthermore, this patent uses a gear pump driven by an electric motor as the oil pump, but it does not provide specific guidance on how to ensure a reliable connection and seal between the motor and the gear pump to prevent oil leakage. The sealing effect between the oil pump and the valve body has always been a challenging issue in the industry. In particular, CN202274265U places the motor and oil pump on opposite sides of the valve body, establishing an oil circuit between the oil pump, the oil tank, and the cylinder. This layout makes the entire hydraulic mechanism more spatially dispersed. While it offers advantages in terms of ease of installation and flexibility, it lacks compactness and results in a large size, which are its drawbacks. For example, CN207877842U describes a "multi-functional electric jack for vehicles," which features a motor equipped with a reduction gearbox, and is otherwise essentially the same as CN202274265U. Similarly, CN201704016U discloses a "vehicle jack," whose structure, involving a motor, oil tank, gear pump, and valve body, is also largely identical to CN202274265U. Furthermore, CN221216969U relates to a "pump core structure of an electric hydraulic horizontal jack pump," where the pump's structure uses an eccentric wheel driven by a motor, as detailed in paragraphs 0033 to 0034 of the patent's specification. The eccentric motion of the eccentric wheel causes periodic volume changes in the connected pump body, thus achieving direct oil suction and discharge. However, due to the limitations of the eccentric wheel's motion characteristics, flow and pressure fluctuations are significant, making it unsuitable for applications requiring stable flow and pressure.

[0005] While the aforementioned patents each describe their technical effects in their specifications, they also each have their shortcomings. In particular, considering factors such as resource conservation, functional diversification, and ease of management (e.g., storage), integrating electric and manual modes is undoubtedly a highly beneficial approach. When the lifting load is light and the pressure is below the pressure regulating valve's set value, the electric mode can be used, making lifting convenient, quick, and labor-saving. When the lifting load is heavy and the pressure exceeds the pressure regulating valve's set value, the manual mode can be used. However, existing technologies have not provided inspiration for hydraulic devices that meet the aforementioned structural requirements for integrated manual and automatic jacks. The technical solution described below arose in this context. Utility Model Content

[0006] The objective of this invention is to provide a hydraulic device that significantly simplifies the structure and reduces the size by eliminating the need for an oil tank and establishing a direct connection between the motor and the oil pump. This device also facilitates the integration of manual and automatic functions to meet specific and flexible usage requirements, saves resources, optimizes the distribution of the motor, oil pump, and manual operating mechanism on the same side of the valve body, and places the oil cylinder on the other side, thus facilitating maintenance, reducing the flow resistance of the hydraulic oil, ensuring reliable installation, and providing safe operation.

[0007] The present invention accomplishes its objective as follows: a hydraulic device for a manual / automatic integrated jack, comprising a motor, an oil pump, a valve body, an oil cylinder, and a manual pumping and returning oil operating mechanism. The motor is characterized by being drive-connected to the oil pump, with both the pump and motor horizontally positioned on the right side of the valve body. The manual pumping and returning oil operating mechanism, accompanying the oil pump, is also positioned on the right side of the valve body. The oil cylinder is horizontally positioned on the left side of the valve body. The oil pump is a gear pump and communicates with the oil cylinder through an oil passage within the valve body. Similarly, the manual pumping and returning oil operating mechanism communicates with the oil cylinder through an oil passage within the valve body.

[0008] In a specific embodiment of this utility model, a pump cover flange mating cavity recessed into the right side surface of the valve body is provided at the center of the right side of the valve body. A first oil inlet / outlet hole, a second oil inlet / outlet hole, a pump drive shaft pivot support hole, and a pump driven shaft pivot support hole are provided within this oil pump cover flange mating cavity. The first and second oil inlet / outlet holes communicate with the oil cylinder through oil passages provided within the valve body. The oil pump mates with the oil pump cover flange mating cavity and... It also rotatably engages with the pivot bearing holes of the oil pump drive shaft and the oil pump driven shaft; a cylinder seat is formed in the central region on the left side of the valve body, and the cylinder seat forms a cylinder sleeve mating cavity. An automatic oil inlet / return hole, a manual operation oil inlet hole, and a manual operation oil return hole are provided in the cylinder sleeve mating cavity. A universal oil return hole, an automatic pressure relief oil return hole, an automatic operation suction hole, a manual operation suction hole, and a manual pressure relief oil return hole are spaced apart on the left end face of the cylinder seat. The cylinder is positioned horizontally. The right end of the cylinder mates with the cylinder sleeve cavity; a manual pump seat is formed on the right side of the valve body, corresponding to the rear of the pump cover flange cavity. This manual pump seat forms a manual pump fixing cavity, with a manual pump oil hole and a manual pump pressure relief hole at the bottom. A manual return valve stem seat is formed on the right side of the valve body, corresponding to the position above the manual pump seat. This manual return valve stem seat forms a manual return valve stem cavity. The bottom of the valve stem cavity communicates with the manual operation return oil hole. The automatic inlet and return oil hole, the manual operation inlet oil hole, the manual operation return oil hole, the universal return oil hole, the automatic pressure relief return oil hole, the automatic operation suction oil hole, the manual operation suction oil hole, and the manual pressure relief return oil hole are all connected to the oil cylinder through oil passages opened in the valve body. The manual pumping and return oil operation mechanism includes a manual pumping device and a manual return oil operation device. The manual pumping device is connected to the manual pump seat, and the manual return oil operation device is connected to the manual return oil valve stem seat.

[0009] In another specific embodiment of this utility model, the oil pump is driven by the motor through a transition connection mechanism disposed between the oil pump and the motor. The oil pump includes an oil pump cover, an oil pump drive shaft, an oil pump driven shaft, an oil pump drive shaft gear, and an oil pump driven shaft gear. An oil pump cover flange protruding from the left side of the oil pump cover is formed in the left-side central region of the oil pump cover and at a position corresponding to the oil pump cover flange mating cavity. This oil pump cover flange is inserted into the oil pump cover flange mating cavity to form a mutually compensating mating relationship with the oil pump cover flange mating cavity. A set of spaced-apart oil pump cover fixing screws fix the oil pump cover to the valve body at a position corresponding to the oil pump cover fixing screw hole opened on the right side of the valve body. The right end of the oil pump drive shaft extends to the right side of the oil pump cover through the oil pump drive shaft hole opened in the center of the oil pump cover and is driven by the transition connection mechanism. The left end of the oil pump drive shaft is rotatably supported by the oil pump drive shaft. Within the pivot support hole, the right end of the oil pump driven shaft is rotatably supported in the oil pump driven shaft support hole located on the left side of the oil pump cover, while the left end of the oil pump driven shaft is rotatably supported in the same pivot support hole. The oil pump drive shaft gear is fixed to the oil pump drive shaft within the flange mating cavity of the oil pump cover, and the oil pump driven shaft gear is fixed to the oil pump driven shaft within the same flange mating cavity of the oil pump cover and meshes with the oil pump drive shaft gear. A [further details about the design and installation are missing from the original text.] A pump cover flange sealing ring is provided, and the left side of the pump cover flange is in sealing contact with the pump cover flange sealing ring; a drive shaft sealing sleeve hole with a diameter larger than the diameter of the oil pump drive shaft hole is opened at the center of the oil pump cover and at the position corresponding to the oil pump drive shaft hole; a main shaft sealing sleeve is embedded in the drive shaft sealing sleeve hole; the oil pump drive shaft passes through the oil pump drive shaft hole and then through the drive shaft sealing sleeve and extends to the right side of the drive shaft sealing sleeve to drively connect with the transition connection mechanism.

[0010] In another specific embodiment of this utility model, 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 connecting sleeve, a motor shaft fixing plate, and a motor fixing connection seat. The outer protective box has an outer protective box cavity with an open right side. A transition connecting sleeve pivoting hole is provided on the bottom wall of the left side of the outer protective box cavity and at the center of the bottom wall. The middle part of the transition connecting sleeve corresponds to the transition connecting sleeve pivoting hole, the right end of which extends into the outer protective box cavity, and the left end extends to the left side of the bottom wall of the cavity. The motor shaft fixing plate is disposed in the outer protective box cavity at the position corresponding to the right end of the transition connecting sleeve. The motor fixing connection seat is disposed on the left side of the outer protective box, and the motor fixing connection seat is fixed to the right side of the oil pump cover by at least one pair of motor fixing connection seat screws passing through the outer protective box screw holes on the outer protective box and then screwed into the pump cover screw holes on the oil pump cover. A motor shaft passage hole is provided in the center of the motor mounting bracket, extending from the left side to the right side of the motor mounting bracket. This motor shaft passage hole corresponds to the motor shaft mounting plate hole formed in the motor shaft mounting plate, which is located in the center of the transition connecting sleeve. A motor shaft mounting plate shaft extends to the left from the center of the left side of the motor shaft mounting plate, corresponding to the oil pump drive shaft insertion hole. The motor shaft faces left, passes through the motor shaft passage hole of the motor mounting bracket, and is inserted into the motor shaft mounting plate hole. It is then fixed to the motor shaft mounting plate with a key at the position of the motor shaft mounting plate hole. The motor is fixed to the right side of the motor mounting bracket by motor fixing screws. The right end of the oil pump drive shaft extends to the left end of the oil pump drive shaft insertion hole of the transition connecting sleeve after passing through the drive shaft sealing sleeve, while the motor shaft mounting plate shaft is inserted into the right end of the oil pump drive shaft insertion hole of the transition connecting sleeve.

[0011] In another specific embodiment of this utility model, the cross-sectional shape of the right end of the oil pump drive shaft and the cross-sectional shape of the motor shaft fixing disc are both D-shaped. The cross-sectional shape of the oil pump drive shaft insertion hole of the transition connecting sleeve is also D-shaped. A motor shaft key groove is formed on the hole wall of the motor shaft fixing disc hole, and a motor shaft key is formed on the motor shaft at a position corresponding to the motor shaft key groove. The motor shaft key mates with the motor shaft key groove. The motor is a DC motor with forward and reverse rotation functions.

[0012] In another specific embodiment of this utility model, a cylinder outer sleeve fitting groove is recessed into the left side of the cylinder seat on the left side of the cylinder seat, which is located in the central region on the left side of the valve body and surrounds the circumference of the cylinder seat. The cylinder includes a cylinder outer sleeve, a cylinder plunger sleeve, a cylinder oil storage chamber, a cylinder plunger, and a pressure oil chamber. The right end of the cylinder outer sleeve is sealed and fitted with the cylinder outer sleeve fitting groove, and the right end of the cylinder plunger sleeve is fitted with the cylinder plunger sleeve mating cavity and sealed by the cylinder plunger sleeve sealing ring. The cylinder oil storage chamber is located in the cylinder... Between the outer wall of the cylinder sleeve and the inner wall of the cylinder outer sleeve, the cylinder column moves left and right within the cylinder column sleeve. A cylinder column piston is located at the right end of the cylinder column, and a cylinder column piston sealing ring is fitted onto the piston. The cylinder column piston and the sealing ring together divide the pressure oil chamber into a left oil chamber located to the left of the piston and a right oil chamber located to the right of the piston. The universal oil return hole, automatic pressure relief oil return hole, automatic operation suction oil hole, manual operation suction oil hole, and manual pressure relief oil return hole communicate with the cylinder oil storage chamber.

[0013] In a further specific embodiment of this utility model, the manual pumping device includes a pump body, a pump core, a pump core return spring, and a return spring support cap. The lower end of the pump body extends into the manual pump fixing cavity, and an outer wall thread is formed on the outer wall of the lower end of the pump body. This outer wall thread engages with the cavity wall thread of the manual pump fixing cavity. The upper end of the pump body extends out of the manual pump fixing cavity, and the lower end of the pump core is vertically displaced and accommodated in the pump core receiving cavity of the pump body, and each of the two spaced-apart pump core sealing ring grooves on the outer wall of the lower end of the pump core is located within the groove. A pump core sealing ring is provided to form a sealing fit between the pump core and the wall of the pump core receiving cavity. The upper end of the pump core extends outside the pump core receiving cavity. A return spring support cap is corresponding to the upper end of the pump core through a support cap center hole formed at the center of its top wall, through which the lower end of the pump core passes downward. The return spring support cap is defined by a return spring support sleeve flange formed at the upper end of the pump core with a diameter larger than the center hole of the support cap. The pump core return spring is sleeved outside the pump body, and the lower end of the pump core return spring is supported by a pump core return spring support formed in the fixed cavity of the manual pump. On the step, the upper end of the pump core return spring extends into the return spring support cap and is supported on the top wall of the return spring support cap cavity; the manual return oil operation device includes a manual return oil valve rod, a manual return oil valve rod connector, a manual return oil valve rod connector rotating rod, and a connector hinge block. The lower end of the manual return oil valve rod is inserted into the manual return oil valve rod cavity and engages with the thread formed on the cavity wall of the manual return oil valve rod cavity. The upper end of the manual return oil valve rod extends out of the manual return oil valve rod cavity. The lower end of the manual return oil valve rod connector is connected to the upper end of the manual return oil valve rod and is controlled by the manual return oil valve. The rod connector is locked with a locking screw. A pair of manual return valve rod connector hinge ears extend from the upper end of the manual return valve rod connector in a face-to-face state. The pair of manual return valve rod connector hinge ears are hinged to the connector hinge block at the lower end corresponding to the pair of manual return valve rod connector hinge ears by a manual return valve rod connector hinge ear pin. A pair of rotating rod hinge ears are formed at the lower end of the manual return valve rod connector rotating rod. The pair of rotating rod hinge ears are hinged to the connector hinge block at the upper end corresponding to the pair of rotating rod hinge ears by a rotating rod hinge ear pin.

[0014] In a further specific embodiment of this utility model, a first inlet and return oil passage is longitudinally formed on the valve body. This first inlet and return oil passage communicates with both the automatic operation suction port and the valve body's first inlet and return oil port. Within this first inlet and return oil passage, a ball valve and a limiting rod are sequentially arranged from bottom to top to allow or block the automatic operation suction port from communicating with or blocking the valve body's first inlet and return oil port. The upper end of the ball valve limit rod has a ball valve limit rod plug for the first inlet and return oil passage of the valve body. This ball valve limit rod plug for the first inlet and return oil passage of the valve body is threaded into a first plug hole opened in the upper part of the valve body. A valve body oil inlet channel is opened in the lower front part of the valve body. The rear end of the valve body oil inlet channel communicates with the automatic inlet and return oil hole. A valve body oil inlet channel plug is provided at the front end corresponding to the valve body oil inlet channel. This valve body oil inlet channel plug is threaded into a second plug hole opened in the lower front part of the valve body. The valve body has a threaded connection to the plug hole. A control valve channel is provided within the valve body to allow or block the second inlet / outlet oil hole of the valve body from communicating with or blocking the automatic inlet / outlet oil hole. Within this control valve channel, from bottom to top, are arranged a support spring plug, a control valve channel steel ball support spring, a control valve steel ball, a control valve core, and a control valve core plug. A valve core sealing ring is provided on the control valve core. A lower valve stem extends from the lower end of the control valve core, and an upper valve stem extends from the upper end. The lower side of the control valve steel ball is supported on the upper end of the control valve channel steel ball support spring, while the lower end of the control valve channel steel ball support spring is supported on the support spring plug. The support spring plug is threadedly connected to the support spring plug hole located at the lower front end of the valve body. The lower end of the lower valve stem contacts the upper side of the control valve steel ball, and the upper end of the upper valve stem contacts the lower end of the control valve core plug. The upper end of the control valve core plug is threadedly connected to the control valve core plug hole located on the upper side of the valve body.

[0015] In another specific embodiment of this utility model, a first return oil channel and a second return oil channel are provided in the valve body. One end of the first return oil channel communicates with the first inlet and outlet oil passage of the valve body, and the middle part, corresponding to the position above the control valve core, communicates with the control valve passage. A first return oil channel ball valve is provided at the front end of the first return oil channel, which is limited by the rear end of a first return oil channel ball valve plug. The front end of the first return oil channel ball valve plug is threadedly engaged with a first return oil channel ball valve plug hole on the front side of the valve body. The second return oil channel is located below the first return oil channel in a transverse parallel state, and one end of the second return oil channel is connected to a third return oil passage in the valve body. The second return oil passage is connected to the control valve core in the middle and is also connected to the control valve channel. A second return oil passage ball valve is provided at the front end of the second return oil passage. The second return oil passage ball valve is limited by the rear end of the second return oil passage ball valve plug. The front end of the second return oil passage ball valve plug is threadedly engaged with a hole on the front side of the valve body corresponding to the second return oil passage ball valve plug hole. The third return oil passage is connected to the manual operation return oil hole and the general return oil hole. The lower end of the third return oil passage is blocked by the third return oil passage plug. The third return oil passage plug is threadedly engaged with a threaded hole on the valve body. A steel ball is provided at the position corresponding to the manual operation return oil hole.

[0016] In another specific embodiment of this utility model, an automatic pressure relief channel is provided in the valve body. This automatic pressure relief channel communicates with the second inlet and outlet oil holes and the automatic pressure relief return oil hole of the valve body. A pressure regulating ball valve is provided on the channel corresponding to the automatic pressure relief channel. The pressure regulating ball valve is controlled by a pressure regulating ball valve plug, and the pressure regulating ball valve plug is threadedly engaged with a pressure regulating ball valve plug hole located on the upper part of the valve body and corresponding to the rear side of the control valve core plug hole. A manual pump pressure relief oil passage is provided in the valve body. This manual pump pressure relief oil passage communicates with the manual pump pressure relief hole and the manual pressure relief return oil hole. A manual pump pressure relief oil passage ball valve is installed on the valve body. This manual pump pressure relief oil passage ball valve is controlled by a pressure regulating screw plug, which is threaded into a hole located on the upper right side of the valve body. A manual pump oil passage is provided on the valve body, which communicates with the manual pump oil hole, the manual operation suction hole, and the manual operation inlet hole. A manual operation suction hole ball valve is installed between the manual pump oil passage and the manual operation suction hole, and a manual operation inlet hole ball valve is installed between the manual pump oil passage and the manual operation inlet hole.

[0017] The technical advantages of the solution provided by this utility model are as follows: By eliminating the oil tank and / or gearbox and establishing a direct transmission connection between the motor and the oil pump, the structure is significantly simplified and the volume reduced; by combining manual and automatic operation, the flexible and targeted selection requirements of using electric operation under light loads and manual operation under heavy loads can be met; since both manual and electric operation are integrated into the same valve body, resources are saved and maintenance is convenient; by placing the motor and oil pump on the same side of the valve body and the oil cylinder on the other side, space is optimized, and the components and weight are rationally distributed relative to the valve body. This facilitates maintenance, reduces the flow resistance of the hydraulic oil, and ensures reliable installation and safe operation. Attached Figure Description

[0018] Figure 1 This is an assembly structure diagram of the present invention;

[0019] Figure 2 for Figure 1 The cross-sectional view of the valve body and the oil cylinder shown;

[0020] Figure 3 for Figure 1 The diagram shows the right side of the valve body;

[0021] Figure 4 for Figure 1 The diagram shows the left side of the valve body;

[0022] Figure 5 This is a schematic diagram of the first inlet and return oil passages of the valve body cut out from the valve body;

[0023] Figure 6 This is a schematic diagram of the valve body oil inlet channel cut out from the valve body;

[0024] Figure 7 This is a schematic diagram of the control valve passage cut out from the valve body;

[0025] Figure 8 This is a schematic diagram showing the first, second, and third return oil passages cut out on the valve body;

[0026] Figure 9 A schematic diagram showing the third return oil passage cut out on the valve body, which connects to the manual operation return oil hole and the general return oil hole;

[0027] Figure 10 This is a schematic diagram of the automatic pressure relief oil passage cut out on the valve body 3;

[0028] Figure 11 This is a schematic diagram of the manual pump oil passage cut out on the valve body 3;

[0029] Figure 12A schematic diagram of the manual pump pressure relief oil passage cut out on valve body 3;

[0030] Figure 13 This is a schematic diagram illustrating an application example of this utility model. Detailed Implementation

[0031] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0032] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are, unless otherwise stated, based on the... Figure 1 The current position is the baseline, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0033] Please see Figure 1 The diagram shows a motor 1, an oil pump 2, a valve body 3 (also referred to as a "base" or "base"), an oil cylinder 4, and a manual oil pumping and return mechanism 7 (manual oil pumping refers to pumping oil manually). The key technical points of the solution provided by this utility model are as follows: the aforementioned motor 1 is connected to the aforementioned oil pump 2 and is horizontally positioned on the right side of the aforementioned valve body 3, while the aforementioned oil cylinder 4 is also horizontally positioned on the left side of the valve body 3. The aforementioned manual oil pumping and return mechanism 7, accompanying the oil pump 2, is also positioned on the right side of the valve body 3, corresponding to the rear side of the oil pump 2. The aforementioned oil pump 2 is a gear pump and communicates with the aforementioned oil cylinder 4 through an oil passage opened within the valve body 3. The aforementioned manual oil pumping and return mechanism 7 also communicates with the oil cylinder 4 through an oil passage opened on the valve body 3.

[0034] Please see Figure 3 , Figure 4 And combined Figure 1A pump cover flange mating cavity 31, recessed into the right side surface of the valve body 3, is provided at the center of the right side of the aforementioned valve body 3. Within this cavity 31 are a first inlet / outlet oil hole 311, a second inlet / outlet oil hole 312, a pump drive shaft pivot bearing hole 313, and a pump driven shaft pivot bearing hole 314. The first inlet / outlet oil hole 311 and the second inlet / outlet oil hole 312 each communicate with the aforementioned oil cylinder 4 through oil passages provided within the valve body 3. The aforementioned oil pump 2 mates with the pump cover flange mating cavity 31 and also simultaneously mates with the aforementioned pump drive shaft pivot bearing hole 313 and the pump driven shaft pivot bearing hole 314. The pivot bearing hole 314 is rotatably fitted; a cylinder seat 32 is formed in the central region on the left side of the aforementioned valve body 3, and the cylinder seat 32 forms a cylinder sleeve mating cavity 321. An automatic oil inlet / outlet hole 3211, a manual operation oil inlet hole 3212, and a manual operation oil return hole 3213 are provided in the cylinder sleeve mating cavity 321. On the left end face 322 of the cylinder seat 32, a universal oil return hole 3221, an automatic pressure relief oil return hole 3222, an automatic operation suction hole 3223, a manual operation suction hole 3224, and a manual pressure relief oil return hole 3225 are spaced apart. The aforementioned cylinder 4 is set in a horizontal position and the right end of the aforementioned cylinder 4 is connected to the aforementioned... The cylinder piston sleeve mates with the cavity 321. On the right side of the valve body 3, and behind the cavity 31 corresponding to the pump cover flange, a manual pump seat 39 is formed. This manual pump seat 39 forms a manual pump fixing cavity 391. A manual pump oil hole 3911 and a manual pump pressure relief hole 3912 are formed at the bottom of the manual pump fixing cavity 391. On the right side of the valve body 3, and above the manual pump seat 39, a manual return valve stem seat 392 is formed. This manual return valve stem seat 392 forms a manual return valve stem cavity 3921. The bottom of the manual return valve stem cavity 3921 mates with the aforementioned manual pump sleeve mate cavity 321. The automatic operation return oil hole 3213 is connected, and the aforementioned automatic inlet and return oil hole 3211, manual operation inlet oil hole 3212, manual operation return oil hole 3213, universal return oil hole 3221, automatic pressure relief return oil hole 3222, automatic operation suction oil hole 3223, manual operation suction oil hole 3224 and manual pressure relief return oil hole 3225 are each connected to the aforementioned oil cylinder 4 through oil passages opened in the valve body 3; the aforementioned manual pumping and return oil operation mechanism 7 includes a manual pumping device 71 and a manual return oil operation device 72. The manual pumping device 71 is connected to the aforementioned manual pump seat 39, and the manual return oil operation device 72 is connected to the manual return oil valve stem seat 392.

[0035] The applicant should explain that: because the aforementioned universal oil return hole 3221 has the dual function of manual oil return and automatic oil return, it is defined as a universal oil return hole.

[0036] Please pay attention. Figure 1The aforementioned oil pump 2 is connected to the aforementioned motor 1 via a transition connection mechanism 5 disposed between the oil pump 2 and the aforementioned motor 1. The oil pump 2 includes an oil pump cover 21, an oil pump drive shaft 22, an oil pump driven shaft 23, an oil pump drive shaft gear 24, and an oil pump driven shaft gear 25. In the left middle region of the oil pump cover 21, and at the position corresponding to the aforementioned oil pump cover flange mating cavity 31, an oil pump cover flange 211 protruding from the left side of the oil pump cover 21 is formed. The oil pump cover flange 211 is inserted into the oil pump cover flange mating cavity 31 and forms a mutually compensating mating relationship with the oil pump cover flange mating cavity 31. A set of spaced-apart oil pump cover fixing screws 212 connects the oil pump cover 21 to the valve body 3 at the position corresponding to the oil pump cover fixing screw hole 315 opened on the right side of the aforementioned valve body 3. The right end of the oil pump drive shaft 22 extends to the right side of the oil pump cover 21 through the oil pump drive shaft hole 213 located in the center of the oil pump cover 21 and is connected to the aforementioned transition connection mechanism 5. The left end of the oil pump drive shaft 22 is rotatably supported in the aforementioned oil pump drive shaft pivot support hole 313. The right end of the oil pump driven shaft 23 is rotatably supported in the oil pump driven shaft support hole 214 located on the left side of the oil pump cover 21. The left end of the oil pump driven shaft 23 is rotatably supported in the aforementioned oil pump driven shaft pivot support hole 314. The oil pump drive shaft gear 24 is fixed to the aforementioned oil pump drive shaft 22 in the aforementioned oil pump cover flange mating cavity 31. The oil pump driven shaft gear 25 is fixed to the aforementioned oil pump driven shaft 23 in the aforementioned oil pump cover flange mating cavity 31 and meshes with the oil pump drive shaft gear 24.

[0037] 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 mating cavity 31. The left side of the aforementioned oil pump cover flange 211 is in sealing contact with the pump cover flange sealing ring 316. At the center of the aforementioned oil pump cover 21 and at the position corresponding to the aforementioned oil pump drive shaft hole 213, a drive shaft sealing sleeve hole 215 with a diameter larger than the diameter of the oil pump drive shaft hole 213 is opened. A main shaft sealing sleeve 2151 is embedded in the drive shaft sealing sleeve hole 215. The aforementioned oil pump drive shaft 22 passes through the oil pump drive shaft hole 213 and then passes through the drive shaft sealing sleeve 2151 and extends to the right side of the drive shaft sealing sleeve 2151 to drively connect with the aforementioned transition connection mechanism 5.

[0038] See you later Figure 1The aforementioned oil pump cover 21 has a pair (or three or four equally spaced) of pump cover screw holes 216. The aforementioned transition connection mechanism 5 includes an outer protective box 51 (also called an "outer sleeve"), a transition connection sleeve 52, a motor shaft fixing plate 53, and a motor fixing connection seat 54. The outer protective box 51 has an outer protective box cavity 511 with an open right side. A transition connection sleeve pivot displacement hole 512 is provided on the bottom wall of the left side of the outer protective box cavity 511 and located at the center of the bottom wall. The middle part of the transition connection sleeve 52 corresponds to the transition connection sleeve pivot. The transfer hole 512 extends into the outer protective box cavity 511 at its right end and extends to the left side of the bottom wall of the cavity at its left end. The motor shaft fixing plate 53 is located in the outer protective box cavity 511 at the position corresponding to the right end of the transition connecting sleeve 52. The motor fixing connection seat 54 is located on the left side of the outer protective box 51, and the motor fixing connection seat 54 is screwed into the pump cover screw hole 216 on the oil pump cover 21 after passing through the outer protective box screw hole 513 on the outer protective box 51 by at least one pair (one pair in this embodiment) of motor fixing connection seat screws 542. The right side is fixed, and a motor shaft through hole 541 is opened in the center of the motor fixing connection seat 54, extending from the left side to the right side of the motor fixing connection seat 54. This motor shaft through hole 541 corresponds to the motor shaft fixing plate hole 531 formed in the motor shaft fixing plate 53, which is formed in the center of the transition connecting sleeve 52. A motor shaft fixing plate shaft 532 corresponding to the oil pump drive shaft insertion hole 521 extends to the left from the center of the left side of the aforementioned motor shaft fixing plate 53; the aforementioned motor 1 The motor shaft 11 faces left. 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. The motor shaft 1 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 right side of the motor fixing connection seat 54 by the motor fixing screw 12. The right end of the aforementioned oil pump drive shaft 22 extends to the left end of the aforementioned transition connection sleeve oil pump drive shaft probing hole 521 after passing through the aforementioned drive shaft sealing sleeve 2151. The aforementioned motor shaft fixing plate shaft 532 is inserted into the right end of the transition connection sleeve oil pump drive shaft probing hole 521.

[0039] Preferably, the cross-sectional shape of the right end of the aforementioned oil pump drive shaft 22 and the cross-sectional shape of the motor shaft fixing disc 532 are both D-shaped, and the cross-sectional shape of the aforementioned transition connecting sleeve oil pump drive shaft insertion hole 521 is also D-shaped. A motor shaft key mating groove 5311 is formed on the hole wall of the aforementioned motor shaft fixing disc hole 531 of the aforementioned motor shaft fixing disc 53, and a motor shaft key is formed on the aforementioned motor shaft 11 at the position corresponding to the motor shaft key mating groove 5311. The motor shaft key mates with the motor shaft key mating groove 5311. The aforementioned motor 1 is a DC motor with forward and reverse rotation functions.

[0040] Please see Figure 2 And combined Figure 1 , Figure 3 and Figure 4 On the left side of the cylinder seat 32, which forms the central region on the left side of the aforementioned valve body 3, and around the circumference of the cylinder seat 32, there is a cylinder outer sleeve fitting groove 323 recessed into the left side of the cylinder seat 32; the aforementioned cylinder 4 includes a cylinder outer sleeve 41, a cylinder plunger sleeve 42, a cylinder oil storage chamber 43, a cylinder plunger 44, and a pressure oil chamber 45. The right end of the cylinder outer sleeve 41 is sealed and fitted with the aforementioned cylinder outer sleeve fitting groove 323, and the right end of the cylinder plunger sleeve 42 is fitted with the aforementioned cylinder plunger sleeve mating cavity 321 and sealed by the cylinder plunger sealing ring 421. The cylinder oil storage chamber 43 is located between the outer wall of the cylinder plunger sleeve 42 and the inner wall of the cylinder outer sleeve 41. The cylinder plunger 44 is movably located inside the cylinder plunger sleeve 42. The right end has a hydraulic cylinder piston 441, and a hydraulic cylinder piston seal ring 4411 is fitted on the hydraulic cylinder piston 441. The hydraulic cylinder piston 441 and the hydraulic cylinder piston seal ring 4411 divide the aforementioned pressure oil chamber 45 into a left oil chamber 451 located on the left side of the hydraulic cylinder piston 441 and a right oil chamber 452 located on the right side of the hydraulic cylinder piston 441. The aforementioned automatic oil inlet and return port 3211, manual operation oil inlet port 3212 and manual operation oil return port 3213 are connected to the aforementioned left oil chamber 452. The aforementioned universal oil return port 3221, automatic pressure relief oil return port 3222, automatic operation suction port 3223, manual operation suction port 3224 and manual pressure relief oil return port 3225 are connected to the aforementioned hydraulic cylinder oil storage chamber 43.

[0041] When motor 1 operates clockwise, the motor shaft 11 drives the motor shaft fixing plate 53, which in turn drives the transition connecting sleeve 52. Simultaneously, the transition connecting sleeve 52 drives the oil pump drive shaft 22 to rotate clockwise accordingly. The oil pump drive shaft 22 drives the oil pump drive shaft gear 24. Since the oil pump driven shaft gear 25 meshes with the oil pump drive shaft gear 24, the rotation of the oil pump drive shaft 22 drives the oil pump driven shaft gear 25. In this state, oil is led from the first oil inlet / outlet hole 311 of the valve body to the oil pump cover flange mating cavity 31, and then led out from the second oil inlet / outlet hole 312 of the valve body. The reverse is also true. In other words, when the motor operates counterclockwise, the oil inlet and outlet process is reversed as described above. That is, the oil pumping mode or operating mode of oil pump 2 is adapted to the forward and reverse operating state of motor 1.

[0042] Still see Figure 1 And combined Figures 5 to 11The aforementioned manual pumping device 71 includes a pump body 711, a pump core 712, a pump core return spring 713, and a return spring support cap 714. The lower end of the pump body 711 extends into the aforementioned manual pump fixing cavity 391, and an outer wall thread 7111 is formed on the outer wall of the lower end of the pump body 711. The outer wall thread 7111 of the pump body 711 engages with the manual pump fixing cavity wall thread 3913 formed on the cavity wall of the manual pump fixing cavity 391. The upper end of the pump body 711 extends out of the manual pump fixing cavity 391. The lower end of the pump core 712 is vertically displaced and accommodated in the pump core receiving cavity 7112 of the pump body 711. A pump core receiving cavity is provided in each of a pair of spaced-apart pump core sealing ring grooves formed on the outer wall of the lower end of the pump core 712 for connecting the pump core 712 with the pump core receiving cavity 7112. The pump core sealing ring 7121 forms a sealing fit with the wall. The upper end of the pump core 712 extends outside the pump core receiving cavity 7112. The return spring support cap 714 is corresponding to the upper end of the pump core 712 through the support cap center hole formed in the center of its top wall, through which the lower end of the pump core 712 passes downward. The return spring support cap 714 is defined by the return spring support sleeve flange edge formed in the upper end of the pump core 712 with a diameter larger than the aforementioned support cap center hole. The pump core return spring 713 is sleeved outside the pump body 711. The lower end of the pump core return spring 713 is supported on the pump core return spring support step 3914 formed in the aforementioned manual pump fixing cavity 391, while the upper end of the pump core return spring 713 extends into the return spring support cap 714 and is supported on the cavity top wall of the return spring support cap cavity.

[0043] The aforementioned manual return valve operating device 72 includes a manual return valve stem 721, a manual return valve stem connector 722, a manual return valve stem connector rotating rod 723, and a connector hinge block 724. The lower end of the manual return valve stem 721 is inserted into the aforementioned manual return valve stem cavity 3921 and engages with a threaded connection formed on the cavity wall of the manual return valve stem cavity 3921. The upper end of the manual return valve stem 721 extends outside the manual return valve stem cavity 3921. The lower end of the manual return valve stem connector 722 is connected to the upper end of the manual return valve stem 721 and locked by a manual return valve stem connector locking screw 7221. The upper end of 2 extends with a pair of manual return valve stem connector hinge ears 7222 facing each other. The pair of manual return valve stem connector hinge ears 7222 are hinged to the aforementioned connector hinge block 724 corresponding to the pair of manual return valve stem connector hinge ears 72221 at the lower end through a manual return valve stem connector hinge ear pin 72221. At the lower end of the manual return valve stem connector rotating rod 723, a pair of rotating rod hinge ears 7231 corresponding to each other are formed. The pair of rotating rod hinge ears 7231 are hinged to the aforementioned connector hinge block 724 corresponding to the pair of rotating rod hinge ears 7231 at the upper end through a rotating rod hinge ear pin 72311.

[0044] Please see Figure 5 A first inlet and return oil passage 33 is provided longitudinally on the aforementioned valve body 3. The first inlet and return oil passage 33 communicates with the aforementioned automatic operation suction hole 3223 and the aforementioned first inlet and return oil hole 311. A first inlet and return oil passage ball valve 331 and a first inlet and return oil passage ball valve limit rod 332 are arranged sequentially from bottom to top in the first inlet and return oil passage 33 to enable or block the automatic operation suction hole 3223 from communicating with or blocking the first inlet and return oil hole 311. The upper end of the first inlet and return oil passage ball valve limit rod 332 has a first inlet and return oil passage ball valve limit rod plug 3321. The first inlet and return oil passage ball valve limit rod plug 3321 is threadedly engaged with the first plug hole 33211 opened in the upper part of the valve body 3.

[0045] Please see Figures 6 to 8 A valve body oil inlet channel 34 is provided at the lower part of the front side (i.e., the front half) of the aforementioned valve body 3. The rear end of the valve body oil inlet channel 34 communicates with the aforementioned automatic oil inlet and return port 3211. A valve body oil inlet channel plug 341 is provided at the front end of the valve body oil inlet channel 34. The valve body oil inlet channel plug 341 is threadedly engaged with the second plug hole 3411 provided at the lower part of the front side of the valve body 3. A control valve channel 342 (also called "valve core control oil channel", hereinafter the same) is provided in the valve body 3 to connect or block the aforementioned valve body second oil inlet and return port 312 with the aforementioned automatic oil inlet and return port 3211. In the control valve channel 342, from bottom to top, a support spring plug 3425, a control valve channel steel ball support spring 3421, a control valve steel ball 3422, a control valve core 3423, and a control valve core plug 3424 are arranged sequentially. 3 is equipped with a valve core sealing ring 34233. A lower valve stem 34231 (i.e., lower valve core push rod) extends from the lower end of the control valve core 3423, while an upper valve stem 34232 (i.e., upper valve core push rod) extends from the upper end. The lower side of the control valve ball 3422 is supported on the upper end of the control valve passage ball support spring 3421, while the lower end of the control valve passage ball support spring 3421 is supported on the aforementioned support spring plug 3425. The support spring plug 3425 is threadedly engaged with the support spring plug hole 34251 located at the lower front end of the valve body 3. The lower end of the lower valve stem 34231 contacts the upward-facing side of the control valve ball 3422, and the upper end of the upper valve stem 34232 contacts the lower end of the control valve core plug 3424. The upper end of the control valve core plug 3424 is threadedly engaged with the control valve core plug hole 34241 located on the upper side of the valve body 3.

[0046] Please pay attention. Figure 8A first return oil passage 35 and a second return oil passage 36 are provided within the valve body 3. One end of the first return oil passage 35 communicates with the first inlet and return oil passage 33 of the valve body, and the middle part, located above the control valve core 3423, communicates with the control valve passage 342. A first return oil passage ball valve 351 is provided at the front end of the first return oil passage 35. The first return oil passage ball valve 351 is limited by the rear end of the first return oil passage ball valve plug 3511, and the front end of the first return oil passage ball valve plug 3511 is threaded into the first return oil passage ball valve plug hole 35111 located on the front side of the valve body 3. The second return oil... The second oil return channel 36 is located below the first oil return channel 35 in a horizontally parallel state. One end of the second oil return channel 36 communicates with the third oil return channel 37 opened in the valve body 3. The middle part also corresponds to the upper part of the aforementioned control valve core 3423 and also communicates with the aforementioned control valve channel 342. A second oil return channel ball valve 361 is provided at the front end of the second oil return channel 36. The second oil return channel ball valve 361 is limited by the rear end of the second oil return channel ball valve plug 3611. The front end of the second oil return channel ball valve plug 3611 is threadedly engaged with the second oil return channel ball valve plug hole 36111 opened on the front side of the valve body 3. The aforementioned third oil return channel 37 communicates with the manual operation oil return hole 3213 and the general oil return hole 3221. The lower end of the third oil return channel 37 is blocked by a third oil return channel plug 371, which is threaded into a third oil return channel plug threaded hole 3711 on the valve body 3. A steel ball 39212 is provided at the upper end, corresponding to the aforementioned manual operation oil return hole 3213. Figure 9 Show).

[0047] Please see Figures 9 to 12An automatic pressure relief channel 38 is provided within the aforementioned valve body 3. This automatic pressure relief channel 38 communicates with the aforementioned valve body's second inlet / outlet oil hole 312 and automatic pressure relief return oil hole 3222. A pressure regulating ball valve 381 is provided on the channel corresponding to the automatic pressure relief channel 38. The pressure regulating ball valve 381 is controlled by a pressure regulating ball valve plug 3811, which is threaded into a pressure regulating ball valve plug hole 38111 located above the valve body 3 and corresponding to the rear side of the aforementioned control valve core plug hole 34241. A manual pump pressure relief oil passage 382 is provided within the aforementioned valve body 3. This manual pump pressure relief oil passage 382 communicates with the aforementioned manual pump pressure relief hole 3912 and the aforementioned manual pressure relief return oil hole 3225. A manual pump pressure relief oil passage steel rod is provided on the channel of the manual pump pressure relief oil passage 382. Ball valve 3821, the manual pump pressure relief oil passage ball valve 3821 is controlled by manual pump pressure relief oil passage ball valve pressure regulating screw plug 38211, and the manual pump pressure relief oil passage ball valve pressure regulating screw plug 38211 is threadedly engaged with the manual pump pressure relief oil passage ball valve pressure regulating screw plug hole 38212 opened at the upper right end of the valve body 3; a manual pump oil passage 383 is opened on the aforementioned valve body 3, the manual pump oil passage 383 is connected to the aforementioned manual pump oil hole 3911, manual operation suction hole 3224 and manual operation inlet hole 3212, a manual operation suction hole ball valve 3831 is provided between the manual pump oil passage 383 and the aforementioned manual operation suction hole 3224, and a manual operation inlet hole ball valve 3832 is provided between the manual pump oil passage 383 and the manual operation inlet hole 3212.

[0048] The applicant needs to emphasize that if the aforementioned oil pump 2 and valve body 3 are integrated into a single structure for the purpose of circumventing this utility model, then it should be considered equivalent to the structure of this application where the oil pump cover 21, which serves as the oil pump body, is fixed to the oil pump cover fixing screw hole 315 on the valve body 3 by the oil pump cover fixing screw 212. Furthermore, if the structure of the oil cylinder 4 is modified formally rather than substantially to increase the oil volume (i.e., increase the oil storage capacity) of the oil cylinder storage chamber 43 of the aforementioned oil cylinder 4 structural system—for example, by abandoning the oil cylinder storage chamber 43 and configuring an oil tank and placing the oil tank in a reasonable position, or by making adaptive changes to the oil passages on the valve body 3—then such modifications should also be considered to fall within the scope of the technical content disclosed in this utility model. The same applies to other mechanisms that will not be elaborated upon further.

[0049] Please see Figure 13 ,because Figure 13 The direction is exactly the same as Figure 1 The directions are opposite, therefore the applicant is in the position of Figure 13 The directional concepts of up, down, left, right, front, and back involved in the description are all based on this. Figure 13 Based on. In Figure 13The diagram shows a hydraulic jack 6, belonging to the category of lifting devices (also known as jacking devices), consisting of a pair of wall panels 61 facing each other. Each wall panel 61 has a traveling wheel 62 mounted on its left and right ends via a traveling wheel axle 621. A lifting arm 63 is shown hinged between the wall panels 61 via a lifting arm hinge shaft 631, and a connecting rod 64 is also shown hinged between the wall panels 61 via a connecting rod hinge shaft 641. A tray 65 is shown engaging with a cylinder column 44 via a tray hinge pin 651. Furthermore, a hand-operated device 8, hinged between the left ends of the wall panels 61, is shown for alternating operation (release and press-down) of the pump core 712 of the aforementioned manual pumping device 71.

[0050] Applicant combined Figures 1 to 13 Briefly describing the working process of this utility model, taking the lifting arm 63 and pallet 65 being lifted by oil intake until the cylinder column 44 extends out of the cylinder body as an example, the motor 1 operates clockwise, causing the motor shaft 11 to rotate clockwise and drive the motor shaft fixing plate 53 and the transition connecting sleeve 52. The transition connecting sleeve 52 drives the oil pump drive shaft 22 and its oil pump drive shaft gear 24. The oil pump drive shaft gear 24 drives the oil pump driven shaft gear 25, which meshes with it and is set on the oil pump driven shaft 23. Under the rotation of the aforementioned oil pump drive and driven shaft gears 24 and 25, the oil pump 2 enters the oil pumping state, that is, it is in the forward working state. Figure 5 The automatic operation suction port 3223 shown draws oil from the oil cylinder storage chamber 43 of the oil cylinder 4. The oil drawn from the oil cylinder storage chamber 43 opens the first inlet and return oil passage steel ball valve 331 of the valve body. The oil enters the first inlet and return oil port 311 of the valve body, and then enters the pump cover flange mating cavity 31 of the oil pump, that is, the pump chamber of the oil pump 2. The oil in the pump cover flange mating cavity 31 of the oil pump, that is, the pump chamber of the oil pump 2, passes through the second inlet and return oil port 312 of the valve body and opens the control valve steel ball 3422. Figure 6 and Figure 8 (as shown), oil sequentially enters through the valve body oil inlet passage 34, the automatic oil inlet and return port 3211, and the cylinder plunger sleeve mating cavity 321. Figure 2 The right oil chamber 452 shown in the figure extends the cylinder rod 44 out of the cylinder body under the pressure of the oil.

[0051] Taking the return oil of the hydraulic cylinder as an example, since the hydraulic pump 2 works in reverse, the hydraulic pump 2 draws oil from the position below the second inlet and return oil hole 312 of the valve body and the lower valve stem 34231. The oil enters the first inlet and return oil hole 311 of the valve body, and then enters the first return oil channel 35 through the first inlet and return oil passage 33 of the valve body. At the position of the upper valve stem 34232, the oil pushes the control valve core 3423 downward and opens (opens) the control valve ball 3422. The oil in the right oil chamber 452... The oil flows sequentially through the automatic oil inlet and return port 3211, the valve body oil inlet channel 34, the control valve channel 342, the valve body second oil inlet and return port 312, the oil pump cover flange mating cavity 31, the valve body first oil inlet and return port 311, the valve body first oil inlet and return channel 33, the valve body first oil return channel 35, the second oil return channel 36, the third oil return channel 37, and the universal oil return port 3221 back into the oil cylinder storage chamber 43, and the aforementioned oil cylinder column 44 moves into the cylinder body.

[0052] Taking automatic pressure relief as an example, if the pressure exceeds the pressure set by the control valve core plug 3424 (i.e., the "pressure relief valve screw") during the lifting process of the hydraulic jack, then the oil enters the automatic pressure relief oil passage 38 through the second inlet and outlet oil hole 312 of the valve body and opens the pressure regulating ball valve 381. Figure 10 As shown), oil enters the oil cylinder storage chamber 43 from the automatic pressure relief return port 3222, completing the automatic pressure relief.

[0053] Taking a manual oil pump as an example, the operator controls the oil pump... Figure 13 The manual operating device 8 is operated so that oil is drawn from the pump core 712 by the action of the manual operating device 8, that is, from the oil suction port 3224 (manual operation). Figure 4 (Showing) Oil is drawn in, and the oil enters the manual pump oil passage 383 through the manually operated oil suction port ball valve 3831, which is pushed open. The oil then enters the manual operation oil inlet port 3212 through the ball valve opened by the oil inlet in the manual pump oil passage 383, and then enters the left oil chamber 451 of the oil cylinder 45. Figure 2 (As shown), this pushes the cylinder column 44 to extend out of the cylinder body, completing the oil pumping in manual operation mode. When depressurization is required in manual operation mode, simply rotate the manual return oil operation device 72 using the hand-operated device 8 to achieve oil release (oil returns to the oil reservoir 43). Specifically: rotate the manual return oil valve rod 723, which, through the rotating rod hinge lug 7231, drives the manual return oil valve rod connector 722 and the manual return oil valve rod 721, releasing the aforementioned pressure and... Figure 9 The steel ball 39212 is used to restrict the flow of oil, which causes the oil to return to the oil reservoir 43 of the oil cylinder, thus completing the pressure relief.

[0054] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A hydraulic device for a manual / automatic integrated jack, comprising a motor (1), an oil pump (2), a valve body (3), an oil cylinder (4), and a manual oil pumping and return mechanism (7), characterized in that: The motor (1) is connected to the oil pump (2) and is mounted on the right side of the valve body (3) in a horizontal position. The manual oil pumping and return mechanism (7) is also mounted on the right side of the valve body (3) in conjunction with the oil pump (2). The oil cylinder (4) is mounted on the left side of the valve body (3) in a horizontal position. The oil pump (2) is a gear pump and is connected to the oil cylinder (4) through an oil passage opened in the valve body (3). The manual oil pumping and return mechanism (7) is also connected to the oil cylinder (4) through an oil passage opened in the valve body (3).

2. The hydraulic device for a manual / automatic integrated jack according to claim 1, characterized in that: A pump cover flange fitting cavity (31) recessed into the right side surface of the valve body (3) is provided at the center of the right side of the valve body (3). A first inlet / outlet oil hole (311), a second inlet / outlet oil hole (312), a pump drive shaft pivot support hole (313), and a pump driven shaft pivot support hole (314) are provided in the pump cover flange fitting cavity (311). The first inlet / outlet oil hole (311) and the second inlet / outlet oil hole (312) are respectively connected to the oil cylinder (4) through oil passages provided in the valve body (3). The oil pump (2) fits with the pump cover flange fitting cavity (31) and also simultaneously with the pump drive shaft pivot support hole (313) and the pump driven shaft pivot support hole. (314) Rotational engagement; A cylinder seat (32) is formed in the central region on the left side of the valve body (3), and the cylinder seat (32) forms a cylinder sleeve engagement cavity (321). An automatic oil inlet / outlet hole (3211), a manual operation oil inlet hole (3212), and a manual operation oil return hole (3213) are provided in the cylinder sleeve engagement cavity (321). On the left end face (322) of the cylinder seat (32), a universal oil return hole (3221), an automatic pressure relief oil return hole (3222), an automatic operation suction hole (3223), a manual operation suction hole (3224), and a manual pressure relief oil return hole (3225) are spaced apart. The cylinder (4) is set in a horizontal position and the right end of the cylinder (4) is connected to the cylinder sleeve engagement cavity (3211). The cylinder sleeve mating cavity (321) is fitted; on the right side of the valve body (3) and behind the oil pump cover flange mating cavity (31), a manual pump seat (39) is also formed. The manual pump seat (39) forms a manual pump fixing cavity (391). A manual pump oil hole (3911) and a manual pump pressure relief hole (3912) are opened at the bottom of the manual pump fixing cavity (391). On the right side of the valve body (3) and above the manual pump seat (39), a manual return valve rod seat (392) is formed. The manual return valve rod seat (392) forms a manual return valve rod cavity (3921). The bottom of the manual return valve rod cavity (3921) is connected to the manual operation... The return oil hole (3213) is connected. The automatic oil inlet and return oil hole (3211), the manual operation oil inlet hole (3212), the manual operation oil return hole (3213), the universal oil return hole (3221), the automatic pressure relief oil return hole (3222), the automatic operation oil suction hole (3223), the manual operation oil suction hole (3224), and the manual pressure relief oil return hole (3225) are all connected to the oil cylinder (4) through oil passages opened in the valve body (3). The manual oil pumping and return oil operation mechanism (7) includes a manual oil pumping device (71) and a manual oil return operation device (72). The manual oil pumping device (71) is connected to the manual pump seat (39), and the manual oil return operation device (72) is connected to the manual oil return valve stem seat (392).

3. The hydraulic device for a manual / automatic integrated jack according to claim 2, characterized in that: The oil pump (2) is 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) includes an oil pump cover (21), an oil pump drive shaft (22), an oil pump driven shaft (23), an oil pump drive shaft gear (24), and an oil pump driven shaft gear (25). In the left middle region of the oil pump cover (21) and at a position corresponding to the oil pump cover flange mating cavity (31), an oil pump cover flange (211) is formed that protrudes from the left side of the oil pump cover (21). The oil pump cover flange (211) is inserted into the oil pump cover flange mating cavity (31) and is connected to the oil pump. The pump cover flange mating cavity (31) forms a mutually compensating mating relationship, and the pump cover (21) is fixed to the valve body (3) at the position corresponding to the pump cover fixing screw hole (315) opened on the right side of the valve body (3) by a set of spaced-apart pump cover fixing screws (212). The right end of the pump drive shaft (22) extends to the right side of the pump cover (21) through the pump drive shaft hole (213) opened in the center of the pump cover (21) and is drivenly connected to the transition connection mechanism (5). The left end of the pump drive shaft (22) is rotatably supported in the pump drive shaft pivot support hole (313). The pump driven shaft The right end of (23) is rotatably supported in the oil pump driven shaft support hole (214) opened on the left side of the oil pump cover (21), while the left end of the oil pump driven shaft (23) is rotatably supported in the oil pump driven shaft pivot support hole (314). The oil pump drive shaft gear (24) is fixed on the oil pump drive shaft (22) in the oil pump cover flange mating cavity (31), and the oil pump driven shaft gear (25) is fixed on the oil pump driven shaft (23) in the oil pump cover flange mating cavity (31) and meshes with the oil pump drive shaft gear (24). A pump cover flange sealing ring (31) is provided on the bottom wall of the oil pump cover flange mating cavity (31). 6) The left side of the pump cover flange (211) is in sealing contact with the pump cover flange sealing ring (316); a drive shaft sealing sleeve hole (215) with a diameter larger than that of the pump drive shaft hole (213) is opened at the center of the pump cover (21) and at the position corresponding to the pump drive shaft hole (213). A main shaft sealing sleeve (2151) is embedded in the drive shaft sealing sleeve hole (215). The pump drive shaft (22) passes through the pump drive shaft hole (213) and then passes through the drive shaft sealing sleeve (2151) and extends to the right side of the drive shaft sealing sleeve (2151) to drive the transition connection mechanism (5).

4. The hydraulic device for a manual / automatic integrated jack according to claim 3, characterized in that: At least one pair of pump cover screw holes (216) are provided on the oil pump cover (21); the 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) has an outer protective box cavity (511) with an open right side. A transition connection sleeve pivot transfer hole (512) is provided on the bottom wall of the cavity on the left side of the outer protective box cavity (511) and located at the center of the bottom wall. The middle part of the transition connection sleeve (52) corresponds to the transition connection sleeve pivot transfer hole (512), and the right end extends into the outer protective box cavity. Inside the outer casing cavity (511), the left end extends to the left side of the bottom wall of the cavity. The motor shaft fixing plate (53) is located in the outer casing cavity (511) at the position corresponding to the right end of the transition connecting sleeve (52). The motor fixing connecting seat (54) is located on the left side of the outer casing (51), and the motor fixing connecting seat (54) is fixed to the right side of the oil pump cover (21) by at least a pair of motor fixing connecting seat screws (542) after passing through the outer casing screw hole (513) opened on the outer casing (51). The motor fixing connecting seat (54) is screwed into the pump cover screw hole (216) opened on the oil pump cover (21). A motor shaft through hole (541) is provided in the center of the motor fixing connector (54), extending from the left side to the right side of the motor fixing connector (54). This motor shaft through hole (541) corresponds to the motor shaft fixing plate hole (531) formed in the motor shaft fixing plate (53), which is located in the center of the transition connecting sleeve (52). A motor shaft fixing plate shaft (532) extends to the left from the center of the left side of the motor shaft fixing plate (53) and corresponds to the oil pump drive shaft insertion hole (521). The motor shaft (11) of the motor (1) faces to the left. The motor shaft (11) passes through the motor shaft through hole (541) of the motor fixing connector and is inserted into the motor shaft fixing plate hole (531). The motor shaft fixing plate hole (531) is fixed with the motor shaft fixing plate (53) by a flat key. The motor (1) is fixed to the right side of the motor fixing connector (54) by the motor fixing screw (12). The right end of the oil pump drive shaft (22) extends to the left end of the transition connecting sleeve oil pump drive shaft probe hole (521) after passing through the drive shaft sealing sleeve (2151). The motor shaft fixing plate shaft (532) is inserted into the right end of the transition connecting sleeve oil pump drive shaft probe hole (521).

5. The hydraulic device for a manual / automatic integrated jack according to claim 4, characterized in that: The cross-sectional shape of the right end of the oil pump drive shaft (22) and the cross-sectional shape of the motor shaft fixing plate shaft (532) are both D-shaped. The cross-sectional shape of the oil pump drive shaft insertion hole (521) of the transition connecting sleeve is also D-shaped. A motor shaft key mating groove (5311) is formed on the hole wall of the motor shaft fixing plate hole (531) of the motor shaft fixing plate (53). A motor shaft key is formed on the motor shaft (11) at the position corresponding to the motor shaft key mating groove (5311). The motor shaft key mates with the motor shaft key mating groove (5311). The motor (1) is a DC motor with forward and reverse rotation functions.

6. The hydraulic device for a manual / automatic integrated jack according to claim 2, characterized in that: On the left side of the cylinder seat (32) in the central region on the left side of the valve body (3), and around the circumference of the cylinder seat (32), there is a cylinder sleeve fitting groove (323) recessed into the left side of the cylinder seat (32); the cylinder (4) includes a cylinder sleeve (41), a cylinder plunger (42), a cylinder oil reservoir (43), a cylinder plunger (44), and a pressure oil chamber (45). The right end of the cylinder sleeve (41) is sealed and fitted with the cylinder sleeve fitting groove (323), and the right end of the cylinder plunger (42) is fitted with the cylinder plunger fitting cavity (321) and sealed by the cylinder plunger sealing ring (421). The cylinder oil reservoir (43) is located between the outer wall of the cylinder plunger (42) and the inner wall of the cylinder sleeve (41). (44) is located inside the cylinder sleeve (42) and moves left and right. There is a cylinder piston (441) at the right end of the cylinder (44), and a cylinder piston sealing ring (4411) is fitted on the cylinder piston (441). The cylinder piston (441) and the cylinder piston sealing ring (4411) divide the pressure oil chamber (45) into a left oil chamber (451) located on the left side of the cylinder piston (441) and a right oil chamber (452) located on the right side of the cylinder piston (441). The universal oil return hole (3221), the automatic pressure relief oil return hole (3222), the automatic operation oil suction hole (3223), the manual operation oil suction hole (3224), and the manual pressure relief oil return hole (3225) are connected to the oil storage chamber (43).

7. The hydraulic device for a manual / automatic integrated jack according to claim 2, characterized in that: The manual pumping device (71) includes a pump body (711), a pump core (712), a pump core return spring (713), and a return spring support cap (714). The lower end of the pump body (711) extends into the manual pump fixing cavity (391), and an outer wall thread (7111) is formed on the outer wall of the lower end of the pump body (711). The outer wall thread (7111) of the pump body (7111) engages with the cavity wall thread (3913) of the manual pump fixing cavity (391). The upper end of the pump body (711) extends out of the manual pump fixing cavity (391). The lower end of the pump core (712) is vertically displaced and accommodated in the pump core receiving cavity (7112) of the pump body (711). A pump core is provided in each of a pair of spaced-apart pump core sealing ring grooves on the outer wall of the lower end of the pump core (712) for connecting the pump core (712) with the pump core receiving cavity (7112). The cavity wall of the receiving cavity forms a pump core sealing ring (7121) for a sealing fit. The upper end of the pump core (712) extends outside the pump core receiving cavity (7112). The return spring support cap (714) is corresponding to the upper end of the pump core (712) through a support cap center hole formed at the center of its top wall for the lower end of the pump core (712) to pass through downward. The return spring support cap (714) is defined by a return spring support sleeve flange edge formed at the upper end of the pump core (712) with a diameter larger than the support cap center hole. The pump core return spring (713) is sleeved outside the pump body (711). The lower end of the pump core return spring (713) is supported on the pump core return spring support step (3914) formed in the manual pump fixing cavity (391), while the upper end of the pump core return spring (713) extends into the return spring support cap (714) and is supported on the cavity top wall of the return spring support cap cavity.The manual return valve operating device (72) includes a manual return valve stem (721), a manual return valve stem connector (722), a manual return valve stem connector rotating rod (723), and a connector hinge block (724). The lower end of the manual return valve stem (721) is inserted into the manual return valve stem cavity (3921) and engages with a thread on the cavity wall of the manual return valve stem cavity (3921). The upper end of the manual return valve stem (721) extends outside the manual return valve stem cavity (3921). The lower end of the manual return valve stem connector (722) is connected to the upper end of the manual return valve stem (721) and locked by a manual return valve stem connector locking screw (7221). The upper end of 722) extends with a pair of manual return valve stem connecting head hinge ears (7222) facing each other. These manual return valve stem connecting head hinge ears (7222) are hinged to the connecting head hinge block (724) corresponding to the lower end of the pair of manual return valve stem connecting head hinge ears (72221) via a manual return valve stem connecting head hinge ear pin (72221). At the lower end of the manual return valve stem connecting head rotating rod (723), a pair of corresponding rotating rod hinge ears (7231) are formed. These rotating rod hinge ears (7231) are hinged to the connecting head hinge block (724) corresponding to the upper end of the pair of rotating rod hinge ears (7231) via a rotating rod hinge ear pin (72311).

8. The hydraulic device for a manual / automatic integrated jack according to claim 6, characterized in that: A first inlet and return oil passage (33) is longitudinally provided on the valve body (3). The first inlet and return oil passage (33) communicates with the automatic operation suction port (3223) and the first inlet and return oil port (311). A first inlet and return oil passage ball valve (331) and a first inlet and return oil passage ball valve limit rod (332) are arranged sequentially from bottom to top in the first inlet and return oil passage (33) for connecting or blocking the automatic operation suction port (3223) with the first inlet and return oil port (311). The upper end of the first inlet and return oil passage ball valve limit rod (332) has a first inlet and return oil passage ball valve limit rod plug (3321). The first inlet and return oil passage of the valve body has a ball valve limit rod plug (3321) that is threaded into the first plug hole (33211) on the upper part of the valve body (3); a valve body oil inlet channel (34) is provided on the lower front side of the valve body (3), the rear end of the valve body oil inlet channel (34) is connected to the automatic inlet and return oil hole (3211), and a valve body oil inlet channel plug (341) is provided at the front end of the valve body oil inlet channel (34), which is threaded into the second plug hole (3411) on the lower front side of the valve body (3); a second inlet and return oil hole (312) is provided in the valve body (3) for connecting the valve body oil inlet and return oil hole (312) with the valve body oil inlet and return oil hole (312). The control valve passage (342) that connects to or blocks the automatic oil inlet / outlet (3211) has the following components arranged sequentially from bottom to top: a support spring plug (3425), a control valve passage steel ball support spring (3421), a control valve steel ball (3422), a control valve core (3423), and a control valve core plug (3424). A valve core sealing ring (34233) is provided on the control valve core (3423). A lower valve stem (34231) extends from the lower end of the control valve core (3423), while an upper valve stem (34232) extends from the upper end. The downward-facing side of the control valve steel ball (3422) is supported by the control valve core. The upper end of the valve passage ball support spring (3421) is supported by the lower end of the control valve passage ball support spring (3421), and the lower end of the control valve passage ball support spring (3421) is supported on the support spring plug (3425). The support spring plug (3425) is threadedly engaged with the support spring plug hole (34251) opened at the lower front end of the valve body (3). The lower end of the lower valve stem (34231) is in contact with the upward-facing side of the control valve ball (3422), and the upper end of the upper valve stem (34232) is in contact with the lower end of the control valve core plug (3424). The upper end of the control valve core plug (3424) is threadedly engaged with the control valve core plug hole (34241) opened on the upper side of the valve body (3).

9. The hydraulic device for a manual / automatic integrated jack according to claim 8, characterized in that: A first return oil passage (35) and a second return oil passage (36) are provided inside the valve body (3). One end of the first return oil passage (35) communicates with the first inlet and outlet oil passage (33) of the valve body, and the middle part, located above the control valve core (3423), communicates with the control valve passage (342). A first return oil passage ball valve (351) is provided at the front end of the first return oil passage (35). The first return oil passage ball valve (351) is formed by the first... The rear end of the first return oil passage ball valve plug (3511) is defined, and the front end of the first return oil passage ball valve plug (3511) is threaded into the first return oil passage ball valve plug hole (35111) opened on the front side of the valve body (3). The second return oil passage (36) is located below the first return oil passage (35) in a transverse parallel state. One end of the second return oil passage (36) communicates with the third return oil passage (37) opened in the valve body (3), and the middle part also corresponds to the control valve. Above the core (3423) and also communicating with the control valve passage (342), a second return oil passage ball valve (361) is provided at the position corresponding to the front end of the second return oil passage (36). The second return oil passage ball valve (361) is limited by the rear end of the second return oil passage ball valve plug (3611). The front end of the second return oil passage ball valve plug (3611) is connected to the hole (3611) of the second return oil passage ball valve plug located on the front side of the valve body (3). 1) Threaded connection, the third oil return channel (37) is connected to the manual operation oil return hole (3213) and the general oil return hole (3221), the lower end of the third oil return channel (37) is blocked by the third oil return channel plug (371), and the third oil return channel plug (371) is threadedly connected to the third oil return channel plug thread hole (3711) opened on the valve body (3); wherein, a steel ball (39212) is provided at the position corresponding to the manual operation oil return hole (3213).

10. The hydraulic device for a manual / automatic integrated jack according to claim 8, characterized in that: An automatic pressure relief channel (38) is provided inside the valve body (3). The automatic pressure relief channel (38) communicates with the second inlet and outlet oil hole (312) and the automatic pressure relief return oil hole (3222) of the valve body. A pressure regulating ball valve (381) is provided on the channel corresponding to the automatic pressure relief channel (38). The pressure regulating ball valve (381) is controlled by a pressure regulating ball valve plug (3811). The pressure regulating ball valve plug (3811) is connected to the valve body. (3) The pressure regulating ball valve plug hole (38111) above and corresponding to the rear side of the control valve core plug hole (34241) is threadedly engaged; a manual pump pressure relief oil passage (382) is provided in the valve body (3), which communicates with the manual pump pressure relief hole (3912) and the manual pressure relief return oil hole (3225), and a manual pump pressure relief oil passage steel is provided on the passage of the manual pump pressure relief oil passage (382). The ball valve (3821) is controlled by the pressure regulating screw plug (38211) of the manual pump pressure relief oil passage, which is threaded into the pressure regulating screw plug hole (38212) of the manual pump pressure relief oil passage located on the upper right side of the valve body (3). A manual pump oil passage (383) is provided on the valve body (3) for pumping oil. The oil passage (383) is connected to the manual pump oil hole (3911), the manual operation suction hole (3224), and the manual operation inlet hole (3212). A manual operation suction hole ball valve (3831) is provided between the manual pump oil passage (383) and the manual operation suction hole (3224), and a manual operation inlet hole ball valve (3832) is provided between the manual pump oil passage (383) and the manual operation inlet hole (3212).

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