Hydraulic lifting device

Abstract

This utility model discloses a hydraulic lifting device, which includes a lifting frame and at least two hydraulic lifting mechanisms. Each hydraulic lifting mechanism includes a hydraulic cylinder, a guide limiting frame, and an elastic transmission mechanism. The upper end of the piston rod of the hydraulic cylinder is hinged to the lifting frame. The guide limiting frame has two guide rods and two limiting seats fixedly fitted to the two guide rods respectively. The elastic transmission mechanism includes a fixed rod fixedly connected to the lifting frame, a spring sleeved on the fixed rod, and two transmission components cooperating with the spring and the guide limiting frame. The movable seats of the two transmission components of the elastic transmission mechanism are movably sleeved on the fixed rod and respectively abut against the two ends of the spring. The guide seats of the two transmission components of the elastic transmission mechanism are movably sleeved on the two guide rods of the guide limiting frame and movably abut against the lower side of the limiting seats fitted on the corresponding guide rods. This utility model has the advantages of good service life and high reliability.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment, and in particular to a hydraulic lifting device. Background Technology

[0002] Currently, most hydraulic lifting devices used in industrial automated production lines and warehousing and logistics handling equipment adopt a single hydraulic drive mode, that is, the lifting frame bearing the load is directly driven to rise and fall by the extension and retraction of the hydraulic cylinder; this type of hydraulic lifting device has the following shortcomings:

[0003] 1. This type of hydraulic lifting device uses a rigid connection structure, which makes it difficult to cope with the lateral force generated by irregular loads. This can easily cause uneven stress on the components, leading to increased wear or even structural damage and affecting service life.

[0004] 2. During the descent and reset process, this hydraulic lifting device relies solely on the contraction of the hydraulic cylinder to drive the load back down. Due to factors such as mechanical clearance and residual hydraulic pressure, the reset reliability is low, resulting in poor reliability in use.

[0005] In view of the above problems, it is necessary to study a hydraulic lifting device that has the advantages of good service life and high reliability. Utility Model Content

[0006] The purpose of this utility model is to provide a hydraulic lifting device, which has the advantages of good service life and high reliability.

[0007] To achieve the above objectives, the solution of this utility model is:

[0008] A hydraulic lifting device includes a lifting frame and at least two hydraulic lifting mechanisms for driving the lifting frame to rise and fall. Each hydraulic lifting mechanism includes a hydraulic cylinder, a guide limit frame, and an elastic transmission mechanism. The upper end of the piston rod of the hydraulic cylinder is hinged to the lifting frame. The guide limit frame is fixedly disposed relative to the hydraulic cylinder and has two guide rods located on either side of the hydraulic cylinder, and two limit seats fixedly fitted to the two guide rods. The elastic transmission mechanism includes a fixed rod fixedly connected to the lifting frame, a spring sleeved on the fixed rod, and two transmission components cooperating with the spring and the guide limit frame. Each transmission component includes a transmission rod, movable seats hinged to the upper and lower ends of the transmission rod, and guide seats. The movable seats of the two transmission components of the elastic transmission mechanism are movably sleeved on the fixed rod and abut against the two ends of the spring. The guide seats of the two transmission components of the elastic transmission mechanism are movably sleeved on the two guide rods of the guide limit frame and movably abut against the lower side of the limit seats fitted on the corresponding guide rods.

[0009] The transmission rod uses a fisheye bearing.

[0010] The two ends of the transmission rod are respectively hinged to the movable seat and the guide seat via hinge rods.

[0011] The two ends of the fixed rod are respectively fixedly fitted with fixed seats, and the fixed seats are connected to the lifting frame.

[0012] The movable seats of the two transmission components of the elastic transmission mechanism are located between the fixed seats that cooperate with the two ends of the fixed rod.

[0013] The hydraulic lifting mechanism consists of two parts, which are arranged opposite to each other.

[0014] The lifting frame includes two opposing longitudinal beams and multiple crossbeams that connect the two longitudinal beams at both ends; the upper ends of the piston rods of the hydraulic cylinders of the two hydraulic lifting mechanisms are hinged to the two longitudinal beams respectively; and the fixing rods of the two hydraulic lifting mechanisms are fixedly connected to the two longitudinal beams respectively.

[0015] The guide seat has a guide block and a hinge block that are arranged intersectingly. The guide block is movably sleeved on the guide rod and the guide block movably abuts against the lower side of the limiting seat. The hinge block is hinged to the lower end of the transmission rod.

[0016] The guide block of the guide seat is fitted with a bushing that houses the guide rod.

[0017] The hydraulic lifting mechanism also includes a base that is fixedly connected to the guide limit frame and the hydraulic cylinder.

[0018] After adopting the above scheme, the working principle of the hydraulic lifting device of this utility model is as follows:

[0019] When this utility model is in its initial state, the piston rod of the hydraulic cylinder is in a retracted state, the lifting frame is in its lowest position, and the spring of the elastic transmission mechanism is freely extended.

[0020] When this invention is lifted (i.e., when the lifting frame is driven to rise), the hydraulic cylinder is activated, causing the piston rod of the hydraulic cylinder to extend upward and push the lifting frame to rise. Before the lifting frame is driven to rise until the guide seat of the transmission component abuts against the limiting seat, the spring of the elastic transmission mechanism remains freely extended, and the transmission component of the elastic transmission mechanism rises with the lifting frame (the transmission rod does not transmit force at this time). After the lifting frame is driven to rise until the guide seat of the transmission component abuts against the limiting seat, the limiting seat applies force to the guide seat of the transmission component, causing the transmission rod to swing inward (so that the upper ends of the transmission rods of the two transmission components of the elastic transmission mechanism approach each other). In this way, the piston rod of the hydraulic cylinder and the two transmission components of the elastic transmission mechanism act on the lifting frame simultaneously, driving the lifting frame to rise. The movable seats of the two transmission components of the elastic transmission mechanism move towards each other, causing the spring of the elastic transmission mechanism to be compressed, thus storing energy in the spring of the elastic transmission mechanism.

[0021] When the present invention is lowered (i.e., when the lifting frame is driven to descend), the hydraulic cylinder is activated, causing the piston rod of the hydraulic cylinder to retract downward, thereby raising the lifting frame; at the same time, the spring of the elastic transmission mechanism extends, providing a reset pulling force to the two transmission components of the elastic transmission mechanism, enabling the transmission components to pull the lifting frame precisely back to the initial position.

[0022] As described above, this utility model can use an elastic transmission mechanism to assist the hydraulic cylinder in driving the lifting frame to rise and fall, making the lifting of the lifting frame more reliable and thus improving the reliability of this utility model. In addition, the hydraulic lifting mechanism and the lifting frame of this utility model are flexibly connected (i.e., the upper end of the piston rod of the hydraulic cylinder is hinged to the lifting frame, and the upper and lower ends of the transmission rod are respectively hinged to the movable seat and the guide seat). This makes the force on the hydraulic lifting mechanism more balanced, thereby effectively reducing the wear of the hydraulic lifting mechanism and thus making the service life of this utility model longer. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is an exploded view of the structure of this utility model.

[0025] Figure 3 A cross-sectional view of this utility model Figure 1 .

[0026] Figure 4 A cross-sectional view of this utility model Figure 2 .

[0027] Label Explanation:

[0028] Lifting frame A, longitudinal beam A1, transverse beam A2,

[0029] Hydraulic lifting mechanism B,

[0030] Hydraulic cylinder 1, piston rod 11

[0031] Guide limit frame 2, guide rod 21, limit seat 22

[0032] Elastic transmission mechanism 3,

[0033] Fixed rod 31,

[0034] Spring 32,

[0035] Transmission assembly 33, transmission rod 331, movable seat 332, guide seat 333, guide block 3331, hinge block 3332, bushing 3333.

[0036] Fixture 34. Detailed Implementation

[0037] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0038] like Figures 1 to 4 As shown, this utility model discloses a hydraulic lifting device, which includes a lifting frame A and at least two hydraulic lifting mechanisms B for driving the lifting frame A to rise and fall; the hydraulic lifting mechanism B includes a hydraulic cylinder 1, a guide limiting frame 2, and an elastic transmission mechanism 3; the upper end of the piston rod 11 of the hydraulic cylinder 1 is hinged to the lifting frame A; the guide limiting frame 2 is fixedly arranged relative to the hydraulic cylinder 1, and the guide limiting frame 2 has two guide rods 21 respectively located on both sides of the hydraulic cylinder 1, and two limiting seats 22 respectively fixedly fitted to the two guide rods 21; the elastic transmission mechanism 3 includes a fixing rod 31 fixedly connected to the lifting frame A. The spring 32 is sleeved on the fixed rod 31, and two transmission components 33 cooperate with the spring 32 and the guide limit frame 2. The transmission component 33 includes a transmission rod 331, a movable seat 332 and a guide seat 333 respectively hinged to the upper and lower ends of the transmission rod 331; the movable seats 332 of the two transmission components 33 of the elastic transmission mechanism 3 are movably sleeved on the fixed rod 31 and respectively abut against the two ends of the spring 32; the guide seats 333 of the two transmission components 33 of the elastic transmission mechanism 3 are movably sleeved on the two guide rods 21 of the guide limit frame 2 and movably abut against the lower side of the limit seat 22 that cooperates on the corresponding guide rod 21.

[0039] The working principle of the hydraulic lifting device of this utility model is as follows:

[0040] When this utility model is in its initial state, the piston rod 11 of the hydraulic cylinder 1 is in a retracted state, the lifting frame A is in its lowest position, and the spring 32 of the elastic transmission mechanism 3 is freely extended.

[0041] When the present invention is lifted (i.e., when the lifting frame A is driven to rise), the hydraulic cylinder 1 is activated, causing the piston rod 11 of the hydraulic cylinder 1 to extend upward and push the lifting frame A to rise; before the lifting frame A is driven to rise until the guide seat 333 of the transmission assembly 33 abuts against the limiting seat 22, the spring 32 of the elastic transmission mechanism 3 remains freely extended, and the transmission assembly 33 of the elastic transmission mechanism 3 rises with the lifting frame A (the transmission rod 331 does not transmit force at this time); and when the lifting frame A is driven to rise until the guide seat 333 of the transmission assembly 33 abuts against the limiting seat 22... Subsequently, the limiting seat 22 applies force to the guide seat 333 of the transmission component 33, causing the transmission rod 331 to swing inward (so that the upper ends of the transmission rods 331 of the two transmission components 33 of the elastic transmission mechanism 3 approach each other). In this way, the piston rod 11 of the hydraulic cylinder 1 and the two transmission components 33 of the elastic transmission mechanism 3 act on the lifting frame A at the same time, driving the lifting frame A to rise. The movable seats 332 of the two transmission components 33 of the elastic transmission mechanism 3 will move towards each other, causing the spring 32 of the elastic transmission mechanism 3 to be compressed, so that the spring 32 of the elastic transmission mechanism 3 stores energy.

[0042] When the present invention is lowered (i.e. when the lifting frame A is driven to lower), the hydraulic cylinder 1 is activated, causing the piston rod 11 of the hydraulic cylinder 1 to retract downward, thereby causing the lifting frame A to rise; at the same time, the spring 32 of the elastic transmission mechanism 3 extends, providing a reset pulling force to the two transmission components 33 of the elastic transmission mechanism 3, so that the transmission components 33 can pull the lifting frame A back to the initial position accurately.

[0043] As can be seen from the above, this utility model can use the elastic transmission mechanism 3 to assist the hydraulic cylinder 1 in driving the lifting frame A to rise and fall, making the lifting of the lifting frame A more reliable, thereby improving the reliability of this utility model. In addition, the hydraulic lifting mechanism B of this utility model is flexibly connected to the lifting frame A (that is, the upper end of the piston rod 11 of the hydraulic cylinder 1 is hinged to the lifting frame A, and the upper and lower ends of the transmission rod 331 are respectively hinged to the movable seat 332 and the guide seat 333). This makes the force on the hydraulic lifting mechanism B more balanced, thereby effectively reducing the wear of the hydraulic lifting mechanism B and thus making the service life of this utility model better.

[0044] In an embodiment of this utility model, the number of hydraulic lifting mechanisms B can be two, with the two hydraulic lifting devices arranged opposite each other. That is, this utility model uses two hydraulic lifting devices to drive the lifting frame A to rise and fall. The lifting frame A may include two opposing longitudinal beams A1 and multiple crossbeams A2 connected to the two longitudinal beams A1 at both ends respectively; the upper ends of the piston rods 11 of the hydraulic cylinders 1 of the two hydraulic lifting mechanisms B are hinged to the two longitudinal beams A1 respectively; the fixing rods 31 of the two hydraulic lifting mechanisms B are fixedly connected to the two longitudinal beams A1 respectively.

[0045] In this embodiment of the invention, fixed seats 34 are fixedly fitted at both ends of the fixed rod 31. The fixed seats 34 are connected to the longitudinal beam A1 of the lifting frame A, thereby fixing the fixed rod 31 to the lifting frame A. The movable seats 332 of the two transmission components 33 of the elastic transmission mechanism 3 are located between the fixed seats 34 fitted at both ends of the fixed rod 31. The movable seats 332 are limited by the fixed seats 34 and the movable seats 332 to prevent them from coming off.

[0046] In this embodiment of the invention, the transmission rod 331 employs a fisheye bearing with movable ball ends. This allows the transmission rod 331 to automatically adjust the direction of force transmission during force transmission, ensuring the effectiveness of force transmission and enhancing the adaptability of the invention to different loads. The two ends of the transmission rod 331 can be hinged to the movable seat 332 and the guide seat 333 respectively via hinged rods.

[0047] In an embodiment of this utility model, the guide seat 333 has a guide block 3331 and a hinge block 3332 arranged intersectingly. The guide block 3331 movably sleeves the guide rod 21 and movably abuts against the lower side of the limiting seat 22. The hinge block 3332 is hinged to the lower end of the transmission rod 331. This arrangement ensures that the hinge position between the guide seat 333 and the transmission rod 331 avoids the limiting seat 22. Furthermore, the guide block 3331 is fitted with a bushing 3333 that sleeves the guide rod 21 to reduce wear on the guide block 3331 and to ensure smooth movement of the guide seat 333.

[0048] In an embodiment of this utility model, the hydraulic lifting mechanism B may further include a base (not shown) fixedly connected to the guide limit frame 2 and the hydraulic cylinder 1, so that the guide limit frame 2 and the hydraulic cylinder 1 are fixedly arranged relative to each other.

[0049] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A hydraulic lifting device, characterized in that: Includes a lifting frame and at least two hydraulic lifting mechanisms for driving the lifting frame to rise and fall; The hydraulic lifting mechanism includes a hydraulic cylinder, a guide limit frame, and an elastic transmission mechanism. The upper end of the piston rod of the hydraulic cylinder is hinged to the lifting frame. The guide limit frame is fixedly arranged relative to the hydraulic cylinder, and has two guide rods located on both sides of the hydraulic cylinder, and two limit seats fixedly fitted to the two guide rods respectively. The elastic transmission mechanism includes a fixed rod fixedly connected to the lifting frame, a spring sleeved on the fixed rod, and two transmission components that cooperate with the spring and the guide limit frame. The transmission components include a transmission rod, movable seats and guide seats hinged to the upper and lower ends of the transmission rod respectively. The movable seats of the two transmission components of the elastic transmission mechanism are movably sleeved on the fixed rod and abut against the two ends of the spring respectively. The guide seats of the two transmission components of the elastic transmission mechanism are movably sleeved on the two guide rods of the guide limit frame and movably abut against the lower side of the limit seats that cooperate with the corresponding guide rods.

2. The hydraulic lifting device as described in claim 1, characterized in that: The transmission rod uses a fisheye bearing.

3. The hydraulic lifting device as described in claim 1 or 2, characterized in that: The two ends of the transmission rod are respectively hinged to the movable seat and the guide seat via hinge rods.

4. The hydraulic lifting device as described in claim 1, characterized in that: The two ends of the fixed rod are respectively fixedly fitted with fixed seats, and the fixed seats are connected to the lifting frame.

5. The hydraulic lifting device as described in claim 2, characterized in that: The movable seats of the two transmission components of the elastic transmission mechanism are located between the fixed seats that cooperate with the two ends of the fixed rod.

6. The hydraulic lifting device as described in claim 1, characterized in that: The hydraulic lifting mechanism consists of two parts, which are arranged opposite to each other.

7. The hydraulic lifting device as described in claim 6, characterized in that: The lifting frame includes two opposing longitudinal beams and multiple crossbeams that connect the two longitudinal beams at both ends; the upper ends of the piston rods of the hydraulic cylinders of the two hydraulic lifting mechanisms are hinged to the two longitudinal beams respectively; and the fixing rods of the two hydraulic lifting mechanisms are fixedly connected to the two longitudinal beams respectively.

8. The hydraulic lifting device as described in claim 1, characterized in that: The guide seat has a guide block and a hinge block that are arranged intersectingly. The guide block is movably sleeved on the guide rod and the guide block movably abuts against the lower side of the limiting seat. The hinge block is hinged to the lower end of the transmission rod.

9. The hydraulic lifting device as described in claim 8, characterized in that: The guide block of the guide seat is fitted with a bushing that houses the guide rod.

10. The hydraulic lifting device as described in claim 1, characterized in that: The hydraulic lifting mechanism also includes a base that is fixedly connected to the guide limit frame and the hydraulic cylinder.

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