Hydraulic jack with multiple locking functions

Abstract

The invention relates to the technical field of hydraulic jacks, and discloses a hydraulic jack with multiple locking functions, which comprises a base and a locking unit, wherein a small oil cylinder and an outer sleeve are fixed to the base, a jacking oil cylinder is arranged in the outer sleeve, an open groove is formed in the bottom face of the base, and a jacking rod and a jacking disc are arranged on the jacking oil cylinder. According to the hydraulic jack, through the design of the first locking assembly, after a heavy object is jacked by the hydraulic jack, the contact area between the base and the ground can be increased through the pressing plate, the stability of the base on the ground is remarkably improved, the base is effectively prevented from shaking, and the safety and reliability in the operation process are ensured.

Description

Technical Field

[0001] This invention relates to the field of hydraulic jack technology, and more particularly to a hydraulic jack with multiple locking functions. Background Technology

[0002] A hydraulic jack is a type of jack that uses a plunger or hydraulic cylinder as a rigid lifting component. It features a compact structure, stable operation, large lifting force, and self-locking capability.

[0003] A search revealed that Chinese patent CN205381897U discloses a bidirectional hydraulic jack. This jack utilizes a specially designed bidirectional switching valve within the base, a backpressure chamber between the cylinder and the large plunger, an oil guide pipe at the upper end of the cylinder, and a high-pressure lowering oil pipe within the reservoir. The upper end of the high-pressure lowering oil pipe connects to the oil guide pipe, and the lower end connects to the bidirectional switching valve. Adjusting the bidirectional switching valve controls the raising and lowering of the large plunger. Compared to existing technologies, this solution, using a pump, not only solves the major safety issue of heavy objects falling too quickly after pressure release in hydraulic jacks, but also allows the large plunger to return to its original position after the object falls. Furthermore, it enables precise raising and lowering of heavy objects, broadening the application of hydraulic jacks. It can be used not only in vertical hydraulic jacks but also in horizontal and pneumatic hydraulic jacks, and is safer and more reliable in use. However, in practical application, the above solution still has the following shortcomings:

[0004] The hydraulic jack proposed in the above solution does not have a locking function. When the hydraulic jack lifts a heavy object, it relies heavily on the internal oil and a one-way flow limiting circuit to support the object. If the internal oil leaks or the one-way flow limiting circuit malfunctions while the hydraulic jack is supporting a heavy object for a long time, the supporting force may drop sharply, causing the heavy object to fall suddenly, resulting in equipment damage or even personal injury. In addition, the hydraulic jack has certain requirements for the working environment, such as temperature and vibration. In environments with frequent temperature changes or large vibrations, the viscosity and fluidity of the oil will be affected, which in turn affects the supporting stability of the jack.

[0005] Therefore, a hydraulic jack with multiple locking functions needs to be designed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a hydraulic jack with multiple locking functions.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A hydraulic jack with multiple locking functions includes a base and a locking unit;

[0009] The base is fixed with a small oil cylinder and an outer sleeve. A lifting oil cylinder is arranged inside the outer sleeve. The bottom surface of the base is provided with a slot. A lifting rod and a lifting plate are provided on the lifting oil cylinder.

[0010] The locking unit includes a first locking component, a pulling component, a second locking component, a driving component, and a transmission component;

[0011] The first locking assembly includes a pressure plate, a fixing block, a pressing plate, and a guide rod. The pressure plate is slidably disposed in the slot, and the pressure plate is connected to the top of the slot by a first spring. The fixing block is fixed to the top surface of the pressure plate. The pressing plate is slidably disposed in the slot, and the pressing plate is provided with an inclined surface. The inclined surface of the pressing plate is directly opposite to the fixing block. The pressing plate is connected to the slot wall by a second spring.

[0012] The second locking component includes two connecting plates, two guide sleeves, and two locking blocks. The driving component is used to drive the two locking blocks to move. The driving component and the pulling component are connected by a transmission component.

[0013] As a preferred embodiment of the present invention, the pulling assembly includes a pull rod, a locking block, a fixing ring, and a locking slot. One end of the pull rod is rotatably connected to the extrusion plate, and the other end of the pull rod extends to the outside of the slot. The pull rod passes through the base and is slidably connected to the base. The locking block is fixed to the end of the pull rod located outside the slot. The fixing ring is fixed to the side of the base by two brackets. The pull rod passes through the fixing ring, and the locking slot is formed on the inner ring of the fixing ring.

[0014] As a preferred embodiment of the present invention, both connecting plates are fixed to the top of the top rod, both guide sleeves are fixed to the outer shell, the two connecting plates are slidably disposed in the two guide sleeves, both guide sleeves are provided with openings, and the two locking blocks are respectively disposed opposite the two openings.

[0015] As a preferred embodiment of the present invention, the driving assembly includes two side plates, a threaded rod, a limiting rod, two movable plates, and two arc-shaped plates. The two side plates are fixed on the outer sleeve. The threaded rod is rotatably assembled between the two side plates. The threaded rod has two threaded sections of the same length but with opposite directions. The limiting rod is fixed between the two side plates. The two movable plates are respectively threaded onto the two threaded sections of the threaded rod. The two movable plates are slidably mounted on the limiting rod. One end of each of the two arc-shaped plates is fixedly connected to two locking blocks, and the other end is fixedly connected to the two movable plates.

[0016] As a preferred embodiment of the present invention, the transmission assembly includes a mounting frame, a shaft, a drive gear, a rack, and a connecting structure. The mounting frame is fixed on the outer sleeve, the shaft is rotatably mounted on the mounting frame, and the shaft and the threaded rod are connected by a transmission component. The connection position between the transmission component and the threaded rod is located in the middle of the threaded rod. The drive gear is fixedly sleeved on the shaft, and the rack is slidably mounted on the mounting frame. The rack and the drive gear mesh with each other, and the rack is connected to the pull rod through a connecting component.

[0017] As a preferred embodiment of the present invention, the connecting structure includes two collars, a ball bearing, and a connecting rod. The two collars are fixedly sleeved on the connecting rod, and arc-shaped grooves are formed on the opposite sides of the two collars. The ball bearing is arranged between the two collars and is movably disposed within the two arc-shaped grooves. One end of the connecting rod is fixedly connected to the ball bearing, and the other end is fixedly connected to the rack.

[0018] As a preferred embodiment of the present invention, a fixed cover is fixed on the outer casing, a lifting assembly for driving a small hydraulic cylinder is provided below the fixed cover, and a rotating assembly is provided inside the fixed cover.

[0019] The lifting assembly includes a reciprocating lead screw and a lifting plate. One end of the reciprocating lead screw passes through a fixed cover and is rotatably connected to the fixed cover. The other end of the reciprocating lead screw is connected to an outer sleeve through a bearing seat. The lifting plate is threaded onto the reciprocating lead screw and is connected to the piston rod of a small hydraulic cylinder.

[0020] In a preferred embodiment of the present invention, the rotating assembly includes a rotating rod, a transmission rod, a first rotating shaft, a second rotating shaft, and a driving block. The rotating rod is fixed to one end of the reciprocating screw located inside the fixed cover. The transmission rod, the first rotating shaft, and the second rotating shaft are all rotatably assembled inside the fixed cover. Bevel gears are fixedly fitted onto both the rotating rod and the transmission rod, and the two bevel gears mesh with each other. A first through-hole is formed on the first rotating shaft, and a second through-hole is formed on the second rotating shaft. One end of both the first and second rotating shafts extends to the outside of the fixed cover. The driving block is inserted into the first through-hole. One end of the drive block is fixed with a drive shaft, and a handwheel is mounted on the drive shaft. The transmission rod is connected to the first rotating shaft via a first gear set, and the transmission rod is connected to the second rotating shaft via a second gear set. The first gear set consists of two first gears, which are respectively fixedly sleeved on the transmission rod and the first rotating shaft. The second gear set consists of a second gear and a third gear, with the second gear fixedly sleeved on the transmission rod and the third gear fixedly sleeved on the second rotating shaft. The transmission ratio of the two first gears is 1, and the transmission ratio of the third gear to the second gear is less than 1.

[0021] As a preferred embodiment of the present invention, the cross-sections of the first through-hole, the second through-hole, and the driving block are all rectangular.

[0022] As a preferred embodiment of the present invention, two limiting blocks are fixed on the pressing plate, two limiting grooves are formed in the slot, the two limiting blocks are slidably disposed in the two limiting grooves respectively, the guide rod is fixed inside the slot, and the extrusion plate is slidably sleeved on the guide rod.

[0023] The present invention has the following beneficial effects:

[0024] 1. Through the design of the first locking component, the hydraulic jack in this invention can increase the contact area between the base and the ground through the clamping plate after lifting the heavy object, which significantly improves the stability of the base on the ground, effectively prevents the base from shaking, and ensures the safety and reliability during operation.

[0025] 2. The introduction of the second locking component provides additional support for the jack's push rod. By pressing the connecting plate with the locking block, the structure of the jack is further stabilized, and the support effect on the heavy object is enhanced. This effectively prevents the heavy object from settling or shaking, ensuring that the heavy object can be supported safely and stably.

[0026] 3. This invention, through an innovative drive component design, replaces the traditional lever-driven method by using a reciprocating screw to drive the lifting plate and the piston rod of the small hydraulic cylinder to move up and down. This change not only simplifies the operation process but also significantly improves the moving speed of the lifting rod. Especially in the early stage of lifting heavy objects, the acceleration transmission of the second gear set increases the rotational speed of the reciprocating screw and accelerates the frequency of oil pumping from the small hydraulic cylinder to the large hydraulic cylinder, thereby achieving rapid lifting of the lifting rod and greatly improving work efficiency. When the heavy object is lifted to near the desired position, this invention adjusts the transmission ratio of the drive component to slow down the moving speed of the lifting rod. Specifically, by inserting the drive block into the first rotating shaft and rotating it, the first gear set drives the transmission rod and the reciprocating screw to rotate slowly, thereby achieving slow movement of the lifting plate and slow pumping of oil from the small hydraulic cylinder to the large hydraulic cylinder. This design allows the operator to more precisely control the lifting height of the lifting rod, ensuring that the heavy object can be accurately stopped at the appropriate position, improving the accuracy and safety of the operation. Attached Figure Description

[0027] Figure 1 This invention provides a schematic diagram of the structure of a hydraulic jack with multiple locking functions. Figure 1 ;

[0028] Figure 2 This invention provides a schematic diagram of the structure of a hydraulic jack with multiple locking functions. Figure 2 ;

[0029] Figure 3 This invention provides a schematic diagram of the structure of a hydraulic jack with multiple locking functions. Figure 3 ;

[0030] Figure 4 This invention provides a schematic diagram of the structure of a hydraulic jack with multiple locking functions. Figure 4 ;

[0031] Figure 5 This is a cross-sectional structural schematic diagram of a hydraulic jack with multiple locking functions proposed in this invention.

[0032] Figure 6 A structural diagram of the internal structure of the slotted section;

[0033] Figure 7 A cross-sectional view of the pull-out component;

[0034] Figure 8 This is a structural diagram of the fixed cover and the rotating assembly;

[0035] Figure 9 for Figure 3 Enlarged view of the structure at point A;

[0036] Figure 10 for Figure 4 Enlarged view of the structure at point B;

[0037] Figure 11 for Figure 5 Enlarged view of the structure at point C;

[0038] Figure 12 for Figure 5 Enlarged view of the structure at point D.

[0039] In the diagram: 11. Base; 12. Small hydraulic cylinder; 13. Outer sleeve; 14. Groove; 21. Pressing plate; 22. Limiting groove; 23. Limiting block; 24. Fixing block; 25. First spring; 26. Extrusion plate; 27. Guide rod; 28. Second spring; 31. Pull rod; 32. Clamping block; 33. Fixing ring; 34. Bracket; 35. Bayonet; 41. Connecting plate; 42. Guide sleeve; 43. Through port; 44. Locking block; 45. Side plate; 46. Threaded rod; 47. 48. Limiting rod; 49. Moving plate; 50. Arc plate; 51. Mounting bracket; 52. Shaft; 53. Transmission component; 54. Drive gear; 55. Rack; 56. Collar; 57. Arc groove; 58. Ball bearing; 59. Connecting rod; 61. Fixed cover; 62. Reciprocating screw; 63. Lifting plate; 64. Rotating rod; 65. Transmission rod; 66. First rotating shaft; 67. Second rotating shaft; 68. First through-hole; 69. Second through-hole; 610. Drive block; 611. Drive shaft. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] Reference Figure 1-12 A hydraulic jack with multiple locking functions includes a base 11 and a locking unit. A small oil cylinder 12 and an outer sleeve 13 are fixed on the base 11. A lifting oil cylinder is arranged inside the outer sleeve 13. A slot 14 is opened on the bottom surface of the base 11. A lifting rod and a lifting plate are provided on the lifting oil cylinder.

[0042] The locking unit includes a first locking assembly, a pulling assembly, a second locking assembly, a driving assembly, and a transmission assembly. The first locking assembly includes a pressure plate 21, a fixing block 24, a pressing plate 26, and a guide rod 27. The pressure plate 21 is slidably disposed within the slot 14. Two limiting blocks 23 are fixed on the pressure plate 21. Two limiting grooves 22 are formed within the slot 14. The two limiting blocks 23 are slidably disposed within the two limiting grooves 22, respectively. A first spring is used to connect the pressure plate 21 to the top of the slot 14. The spring 25 is connected to the top surface of the clamping plate 21, the fixing block 24 is fixed to the top surface of the clamping plate 21, the extrusion plate 26 is slidably disposed in the slot 14, and the extrusion plate 26 is provided with an inclined surface, which is set directly opposite to the fixing block 24. The extrusion plate 26 is connected to the slot wall of the slot 14 by the second spring 28, the guide rod 27 is fixed inside the slot 14, and the extrusion plate 26 is slidably sleeved on the guide rod 27. The pulling assembly includes a pull rod 31, a locking block 32, a fixing ring 33 and a locking slot 35. One end of the pull rod 31 is rotatably connected to the extrusion plate 26, and the other end of the pull rod 31 extends to the outside of the slot 14. The pull rod 31 passes through the base 11 and is slidably connected to the base 11. The locking block 32 is fixed to the end of the pull rod 31 located outside the slot 14. The fixing ring 33 is fixed to the side of the base 11 by two brackets 34. The pull rod 31 passes through the fixing ring 33, and the locking slot 35 is opened on the inner ring of the fixing ring 33. When the pull rod 31 moves, it can drive the extrusion plate 26 to move. During the movement of the extrusion plate 26, its inclined part will squeeze the fixing block 24. When the fixing block 24 receives the squeezing action of the inclined surface of the extrusion plate 26, the fixing block 24 can drive the pressing plate 21 to move downward, so that the pressing plate 21 extends out from the slot 14 until the pressing plate 21 presses the ground. In this case, the pressing plate 21 can increase the contact area between the base 11 and the ground, improve the stability of the base 11 on the ground, and prevent the base 11 from shaking.

[0043] The second locking assembly includes two connecting plates 41, two guide sleeves 42, and two locking blocks 44. A drive assembly is used to drive the two locking blocks 44 to move. The drive assembly and the pulling assembly are connected via a transmission assembly. Both connecting plates 41 are fixed to the top of the top rod, and both guide sleeves 42 are fixed to the outer casing. The two connecting plates 41 are slidably disposed within the two guide sleeves 42. Each guide sleeve 42 has an opening 43, and the two locking blocks 44 are respectively positioned opposite the two openings 43. The drive assembly includes two... The structure comprises a side plate 45, a threaded rod 46, a limiting rod 47, two movable plates 48, and two arc-shaped plates 49. The two side plates 45 are fixed to the outer sleeve 13. The threaded rod 46 is rotatably mounted between the two side plates 45 and has two threaded sections of equal length but opposite directions. The limiting rod 47 is fixed between the two side plates 45. The two movable plates 48 are threadedly fitted onto the two threaded sections of the threaded rod 46, and both movable plates 48 are slidably mounted on the limiting rod 47. One end of each of the two arc-shaped plates 49... The transmission assembly includes a mounting bracket 51, a shaft 52, a drive gear 54, a rack 55, and a connecting structure. The shaft 52 is fixedly connected to two locking blocks 44 at one end and to two movable plates 48 at the other. The mounting bracket 51 is fixed to the outer sleeve 13. The shaft 52 is rotatably mounted on the mounting bracket 51. The shaft 52 and the threaded rod 46 are connected via a transmission component 53. The connection point between the transmission component 53 and the threaded rod 46 is located in the middle of the threaded rod 46. The drive gear 54 is fixedly sleeved on the shaft 52, and the rack 55 is slidably mounted. On the mounting bracket 51, the rack 55 meshes with the drive gear 54. The rack 55 is connected to the tie rod 31 through a connector. The connection structure includes two collars 56, balls 58 and a connecting rod 59. Both collars 56 are fixedly sleeved on the tie rod 31. Arc grooves 57 are opened on the opposite sides of the two collars 56. The balls 58 are arranged between the two collars 56 and are movably arranged in the two arc grooves 57. One end of the connecting rod 59 is fixedly connected to the balls 58 and the other end is fixedly connected to the rack 55.

[0044] When the pull rod 31 moves, it can drive the rack 55 to move through the connecting assembly, causing the shaft 52 to rotate. The rotation of the shaft 52 can be transmitted to the threaded rod 46 through the transmission component 53, causing the threaded rod 46 to rotate. The threaded rod 46 is provided with two threaded sections of the same length but with opposite directions. Under the guidance of the limit rod 47, when the threaded rod 46 rotates, it can drive the two moving plates 48 to move closer to each other. When the two moving plates 48 move closer to each other, they can also drive the two locking blocks 44 to move closer to each other through the two arc plates 49. During this process, the two locking blocks 44 are inserted into the two through holes 43 respectively and press down on the two connecting plates 41 respectively. In this state, the two locking blocks 44 can press down on the two connecting plates 41 respectively, playing a role in pressing and fixing the two connecting plates 41. The pressing force applied by the two locking blocks 44 on the two connecting plates 41 provides additional support for the push rod on the large oil cylinder.

[0045] A fixed cover 61 is fixed on the outer casing 13. A lifting assembly for driving the small oil cylinder 12 is provided below the fixed cover 61. A rotating assembly is provided inside the fixed cover 61. The lifting assembly includes a reciprocating screw 62 and a lifting plate 63. One end of the reciprocating screw 62 passes through the fixed cover 61 and is rotatably connected to the fixed cover 61. The other end of the reciprocating screw 62 is connected to the outer casing 13 through a bearing seat. The lifting plate 63 is threaded onto the reciprocating screw 62 and is connected to the piston rod of the small oil cylinder 12.

[0046] The rotating assembly includes a rotating rod 64, a transmission rod 65, a first rotating shaft 66, a second rotating shaft 67, and a drive block 610. The rotating rod 64 is fixed to one end of the reciprocating screw 62 located inside the fixed cover 61. The transmission rod 65, the first rotating shaft 66, and the second rotating shaft 67 are all rotatably assembled inside the fixed cover 61. Both the rotating rod 64 and the transmission rod 65 are fixedly fitted with bevel gears, which mesh with each other. This invention uses a drive assembly and a rotating assembly to drive the top rod upward. Specifically, when the reciprocating screw 62 rotates, it can drive the lifting plate 63. The lifting plate 63 moves up and down, which in turn drives the piston rod of the small oil cylinder 12 to move up and down, causing the small oil cylinder 12 to continuously draw oil from between the outer casing 13 and the large oil cylinder and pump the oil into the large oil cylinder. Finally, it drives the push rod to move upward. The up and down movement of the lifting plate 63 replaces the traditional method of driving the small oil cylinder 12 with a pressure rod. The first rotating shaft 66 has a first through-hole 68, and the second rotating shaft 67 has a second through-hole 69. One end of the first rotating shaft 66 and one end of the second rotating shaft 67 extend to the outside of the fixed cover 61. The drive block 610 is inserted into the first through-hole. Inside 68, a drive shaft 611 is fixed to one end of the drive block 610, and a handwheel is mounted on the drive shaft 611. The transmission rod 65 is connected to the first rotating shaft 66 via a first gear set, and the transmission rod 65 is connected to the second rotating shaft 67 via a second gear set. The first gear set consists of two first gears, which are respectively fixedly sleeved on the transmission rod 65 and the first rotating shaft 66. The second gear set consists of a second gear and a third gear, with the second gear fixedly sleeved on the transmission rod 65 and the third gear fixedly sleeved on the second rotating shaft 67. The transmission ratio of the first gear is 1, and the transmission ratio of the third gear to the second gear is less than 1. The cross-sections of the first through-hole 68, the second through-hole 69, and the drive block 610 are all rectangular. The operator can drive the first rotating shaft 66 and the second rotating shaft 67 through the drive block 610, thereby controlling the moving speed of the push rod. Especially in the early stage of lifting heavy objects, the acceleration transmission of the second gear set increases the rotation speed of the reciprocating screw 62, and the frequency of pumping oil from the small oil cylinder 12 into the large oil cylinder is accelerated, thereby realizing the rapid lifting of the push rod and greatly improving work efficiency.

[0047] The specific working principle of this invention is as follows:

[0048] The hydraulic jack proposed in this invention has two locking methods, achieved through a first locking component and a second locking component. Specifically, after the operator uses the hydraulic jack to lift a heavy object, they can pull the lever 31. When the lever 31 moves, it can drive the pressing plate 26 to move. During the movement of the pressing plate 26, its inclined surface will press against the fixing block 24. When the fixing block 24 receives the pressing action of the inclined surface of the pressing plate 26, the fixing block 24 can drive the clamping plate 21 to move downward, so that the clamping plate 21 extends out of the slot 14 until the clamping plate 21 presses against the ground. In this case, the clamping plate 21 can increase the contact area between the base 11 and the ground, improve the stability of the base 11 on the ground, and prevent the base 11 from shaking. During the movement of the clamping plate 21, the two limiting slots 22 and Two limiting blocks 23 limit the movement of the pressing plate 21, ensuring the stability of the pressing plate 21 during movement. In addition, when the pull rod 31 moves, the locking block 32 on the pull rod 31 will pass through the locking slot 35 on the fixing ring 33. When the pressing plate 21 presses against the ground, the locking block 32 just moves to the side of the fixing ring 33 away from the base 11. At this time, the operator can rotate the pull rod 31 to make the pull rod 31 drive the locking block 32 to rotate until the locking block 32 and the locking slot 35 are misaligned. In this case, the fixing ring 33 will block the locking block 32, and the locking block 32 cannot pass through the locking slot 35 to reset, thus fixing the position of the pull rod 31. When the pull rod 31 is fixed, the pressing plate 26 and the pressing plate 21 will also be fixed. Based on the above process, the operator can quickly lock the pressing plate 21 by rotating the pull rod 31.

[0049] For the second locking assembly, during the movement of the lever 31, the two collars 56 on it move accordingly. A ball bearing 58 is positioned between the two collars 56, causing the two collars 56 to move the ball bearing 58. The movement of the ball bearing 58, in turn, drives the rack 55 to move via the connecting rod 59. During its movement, the rack 55 drives the drive gear 54 to rotate, causing the drive gear 54 to drive the shaft 611 rod 52 to rotate. The shaft 52 and the threaded rod 46 are connected via a transmission component 53. Therefore, the rotation of the shaft 52 is transmitted to the threaded rod 46 via the transmission component 53, causing the threaded rod 46 to rotate. The threaded rod 46 has two threaded sections of the same length but with opposite directions. Under the guidance of the limiting rod 47, the rotation of the threaded rod 46 drives the two moving plates 48 to move closer together. The two locking blocks 44 can be brought closer together by the two arc-shaped plates 49. During this process, the two locking blocks 44 are inserted into the two openings 43 respectively and press down on the two connecting plates 41 respectively. In this state, the two locking blocks 44 can press down on the two connecting plates 41 respectively, and play a role in pressing and fixing the two connecting plates 41. The pressing force applied by the two locking blocks 44 to the two connecting plates 41 provides additional support to the top rod on the large oil cylinder, thereby ensuring the jack's support effect on the heavy object. In summary, the present invention replaces the traditional jack structure by setting the first locking component and the second locking component. The first locking component can improve the stability of the base 11 on the ground, and the second locking component can provide additional support to the top rod, thereby improving the jack's support effect on the heavy object and avoiding the phenomenon of sinking and shaking of the heavy object.

[0050] The jack proposed in this invention employs an innovative driving method, replacing the traditional lever-driven method. In traditional jacks, workers need to repeatedly press the lever to move the jack upwards. With this type of jack, the lifting speed of the lever is slow, requiring multiple presses to lift the heavy object. Furthermore, to achieve a labor-saving effect, the lever is designed to be very long, increasing the overall space occupied by the jack. When lifting a heavy object, the probability of the worker accidentally pressing the lever is relatively high, which can affect the jack's performance. To address the issues of stability in supporting heavy objects, this invention employs a drive assembly and a rotating assembly to drive the push rod upwards. Specifically, when the reciprocating screw 62 rotates, it drives the lifting plate 63 to move up and down. The lifting plate 63, in turn, drives the piston rod of the small oil cylinder 12 to move up and down, causing the small oil cylinder 12 to continuously draw oil from the outer sleeve 13 and the large oil cylinder and pump the oil into the large oil cylinder, ultimately driving the push rod upwards. The upward and downward movement of the lifting plate 63 replaces the traditional method of using a pressure rod to drive the small oil cylinder 12.

[0051] The rotation of the reciprocating screw 62 is driven by a rotating assembly. In the initial stage of lifting the heavy object with the push rod, the operator can insert the drive block 610 into the second through-hole 69 on the second rotating shaft 67 and turn the handwheel. The handwheel's rotation drives the drive block 610 via the drive rod, causing the drive block 610 to rotate the second rotating shaft 67. The transmission rod 65 and the second rotating shaft 67 are connected by a second gear set, which consists of a second gear and a third gear. The second gear is fixedly mounted on the transmission rod 65, and the third gear is fixedly mounted on the second rotating shaft 67. The transmission ratio between the third gear and the second gear is less than 1. When the second rotating shaft 67 rotates, it can drive the second rotating shaft 67 via a... The meshing second and third gears drive the transmission rod 65 to rotate. When the transmission rod 65 rotates, it drives the rotating rod 64 to rotate through two meshing bevel gears. The reciprocating screw 62 connected to the rotating rod 64 rotates accordingly. Since the transmission ratio between the third gear and the second gear is less than 1, the rotation speed of the second rotating shaft 67 can be accelerated under the transmission action of the second gear set. This causes the transmission rod 65 to rotate at high speed. When the transmission rod 65 rotates at high speed, the rotation speed of the reciprocating screw 62 also increases. This increases the movement frequency of the piston rod of the small oil cylinder 12. Under these conditions, the small oil cylinder 12 can quickly pump oil into the large oil cylinder, thereby accelerating the movement speed of the push rod.

[0052] When the load is lifted to the required position, the operator can slowly adjust its position to ensure it stops precisely in the correct location. Specifically, during this process, the operator can insert the drive block 610 into the first through-hole 68 on the first rotating shaft 66, using the drive block 610 to drive the first rotating shaft 66 to rotate. The transmission rod 65 is connected to the first rotating shaft 66 via a first gear set, which consists of two first gears with a transmission ratio of 1. When the first rotating shaft 66 rotates, it drives the transmission rod 65 to rotate via the two meshing first gears, causing the reciprocating screw 62 to rotate accordingly. Since the transmission ratio of the two first gears is 1, the rotation speed of the reciprocating screw 62 will not be increased when the first rotating shaft 66 rotates, allowing the lifting plate 63 to move slowly. The small oil cylinder 12 will also slowly pump oil into the large oil cylinder, causing the lifting rod to move upward slowly. Under these conditions, the operator can then prepare to control the lifting height of the lifting rod.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic jack with multiple locking functions, characterized in that, Includes a base (11) and a locking unit; Among them, a small oil cylinder (12) and an outer sleeve (13) are fixed on the base (11), a lifting oil cylinder is arranged inside the outer sleeve (13), a slot (14) is opened on the bottom surface of the base (11), and a top rod is provided on the lifting oil cylinder; The locking unit includes a first locking component, a pulling component, a second locking component, a driving component, and a transmission component; The first locking assembly includes a pressing plate (21), a fixing block (24), a pressing plate (26), and a guide rod (27). The pressing plate (21) is slidably disposed in the slot (14). The pressing plate (21) and the top of the slot (14) are connected by a first spring (25). The fixing block (24) is fixed on the top surface of the pressing plate (21). The pressing plate (26) is slidably disposed in the slot (14) and has an inclined surface. The pressing plate (26) and the wall of the slot (14) are connected by a second spring (28). The second locking component includes two connecting plates (41), two guide sleeves (42) and two locking blocks (44). The driving component is used to drive the two locking blocks (44) to move. The driving component and the pulling component are connected by a transmission component.

2. A hydraulic jack with multiple locking functions according to claim 1, characterized in that, The pulling assembly includes a pull rod (31), a locking block (32), a fixing ring (33), and a slot (35). One end of the pull rod (31) is rotatably connected to the extrusion plate (26), and the other end of the pull rod (31) extends to the outside of the slot (14). The pull rod (31) passes through the base (11) and is slidably connected to the base (11). The locking block (32) is fixed to the end of the pull rod (31) located outside the slot (14). The fixing ring (33) is fixed to the side of the base (11) by two brackets (34). The pull rod (31) passes through the fixing ring (33), and the slot (35) is opened on the inner ring of the fixing ring (33).

3. A hydraulic jack with multiple locking functions according to claim 2, characterized in that, Both connecting plates (41) are fixed to the top of the top rod, and both guide sleeves (42) are fixed to the outer shell. The two connecting plates (41) are slidably disposed in the two guide sleeves (42). Both guide sleeves (42) have openings (43). The two locking blocks (44) are respectively positioned opposite the two openings (43).

4. A hydraulic jack with multiple locking functions according to claim 3, characterized in that, The drive assembly includes two side plates (45), a threaded rod (46), a limiting rod (47), two movable plates (48), and two arc-shaped plates (49). The two side plates (45) are fixed on the outer sleeve (13). The threaded rod (46) is rotatably assembled between the two side plates (45). The threaded rod (46) is provided with two threaded sections of the same length and opposite direction. The limiting rod (47) is fixed between the two side plates (45). The two movable plates (48) are respectively threaded onto the two threaded sections on the threaded rod (46). The two movable plates (48) are slidably mounted on the limiting rod (47). One end of the two arc-shaped plates (49) is fixedly connected to two locking blocks (44), and the other end is fixedly connected to the two movable plates (48).

5. A hydraulic jack with multiple locking functions according to claim 4, characterized in that, The transmission assembly includes a mounting bracket (51), a shaft (52), a drive gear (54), a rack (55), and a connecting structure. The mounting bracket (51) is fixed on the outer sleeve (13). The shaft (52) is rotatably mounted on the mounting bracket (51). The shaft (52) and the threaded rod (46) are connected by a transmission component (53). The connection position of the transmission component (53) and the threaded rod (46) is located in the middle of the threaded rod (46). The drive gear (54) is fixedly sleeved on the shaft (52). The rack (55) is slidably mounted on the mounting bracket (51). The rack (55) and the drive gear (54) mesh with each other. The rack (55) is connected to the pull rod (31) through a connecting component.

6. A hydraulic jack with multiple locking functions according to claim 5, characterized in that, The connecting structure includes two collars (56), a ball (58), and a connecting rod (59). The two collars (56) are fixedly sleeved on the pull rod (31). The two collars (56) have arc grooves (57) on their opposite sides. The ball (58) is arranged between the two collars (56) and is movably disposed in the two arc grooves (57). One end of the connecting rod (59) is fixedly connected to the ball (58), and the other end is fixedly connected to the rack (55).

7. A hydraulic jack with multiple locking functions according to claim 1, characterized in that, A fixed cover (61) is fixed on the outer cover (13), and a lifting assembly for driving the small oil cylinder (12) is provided below the fixed cover (61). A rotating assembly is provided inside the fixed cover (61). The lifting assembly includes a reciprocating screw (62) and a lifting plate (63). One end of the reciprocating screw (62) passes through a fixed cover (61) and is rotatably connected to the fixed cover (61). The other end of the reciprocating screw (62) is connected to the outer sleeve (13) through a bearing seat. The lifting plate (63) is threaded onto the reciprocating screw (62) and is connected to the piston rod of the small oil cylinder (12).

8. A hydraulic jack with multiple locking functions according to claim 7, characterized in that, The rotating assembly includes a rotating rod (64), a transmission rod (65), a first rotating shaft (66), a second rotating shaft (67), and a driving block (610). The rotating rod (64) is fixed to one end of the reciprocating screw (62) located inside the fixed cover (61). The transmission rod (65), the first rotating shaft (66), and the second rotating shaft (67) are all rotatably assembled inside the fixed cover (61). Bevel gears are fixedly sleeved on both the rotating rod (64) and the transmission rod (65), and the two bevel gears mesh with each other. A first through-hole (68) is opened on the first rotating shaft (66), and a second through-hole (69) is opened on the second rotating shaft (67). One end of the first rotating shaft (66) and one end of the second rotating shaft (67) extend to the outside of the fixed cover (610). The driving block (610) 0) Insert into the first through hole (68), one end of the drive block (610) is fixed with a drive shaft (611), and a handwheel is mounted on the drive shaft (611). The transmission rod (65) is connected to the first rotating shaft (66) through a first gear set. The transmission rod (65) is connected to the second rotating shaft (67) through a second gear set. The first gear set consists of two first gears, which are respectively fixedly sleeved on the transmission rod (65) and the first rotating shaft (66). The second gear set consists of a second gear and a third gear. The second gear is fixedly sleeved on the transmission rod (65), and the third gear is fixedly sleeved on the second rotating shaft (67). The transmission ratio of the two first gears is 1, and the transmission ratio of the third gear to the second gear is less than 1.

9. A hydraulic jack with multiple locking functions according to claim 8, characterized in that, The cross-sections of the first through-hole (68), the second through-hole (69), and the driving block (610) are all rectangular.

10. A hydraulic jack with multiple locking functions according to claim 1, characterized in that, Two limiting blocks (23) are fixed on the pressing plate (21), and two limiting grooves (22) are opened in the slot (14). The two limiting blocks (23) are slidably arranged in the two limiting grooves (22), the guide rod (27) is fixed inside the slot (14), and the extrusion plate (26) is slidably sleeved on the guide rod (27).

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