A two-stage, two-cylinder hydraulic device

Abstract

The utility model discloses a two -stage double -cylinder hydraulic device. The hydraulic device includes: cylinder cover, cylinder base, upper hydraulic cylinder, lower hydraulic cylinder, first oil pipe, second oil pipe, rodless cavity oil pipe, rod cavity oil pipe and connecting rod, be provided with upper hydraulic cylinder, lower hydraulic cylinder, rodless cavity oil pipe, rod cavity oil pipe and connecting rod between cylinder cover and cylinder base, the upper hydraulic cylinder includes upper cylinder barrel and the upper piston rod telescopic in upper cylinder barrel, the upper piston rod passes through cylinder cover and can telescopic stretch out upward, the lower hydraulic cylinder includes lower cylinder barrel and the lower piston rod telescopic in lower cylinder barrel, the lower piston rod passes through cylinder base and can telescopic stretch out downward, first oil pipe is communicated with the rodless cavity of upper cylinder barrel and the rodless cavity of lower cylinder barrel through rodless cavity oil circuit and rodless cavity oil pipe, and second oil pipe is communicated with the rod cavity of upper cylinder barrel and the rod cavity of lower cylinder barrel through rod cavity oil circuit and rod cavity oil pipe. The device is more suitable for square column lifting of operating table.

Description

Technical Field

[0001] This utility model belongs to the field of medical equipment technology, specifically a two-stage, two-cylinder hydraulic device. Background Technology

[0002] The modern operating table is a crucial piece of equipment in surgical procedures, and its stability and adjustability directly affect surgical precision and the efficiency of medical staff. As a core functional module of the operating table, the column lifting system must meet requirements such as precise positioning, stepless adjustment, low noise, and high load capacity.

[0003] Currently, most mainstream hydraulic lifting systems for operating tables use single-stage or double-stage hydraulic cylinders. However, these systems have the following drawbacks in practical applications: The stroke and size of a single-stage hydraulic cylinder are contradictory: to achieve a larger lifting range (e.g., 500-1000mm), the cylinder length needs to be significantly increased, resulting in a bulky column structure and affecting the utilization rate of operating room space; insufficient rigidity: long-stroke single-stage cylinders are prone to radial sway under cantilever loads, especially when adjusting the patient's position during surgery, which may cause slight vibrations on the bed surface, threatening surgical precision; ordinary double-stage hydraulic cylinders can achieve a lower height and larger lifting range, but the cylinder diameters of the first and second stages are different, resulting in speed differences during transitions. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technology and propose a two-stage, two-cylinder hydraulic device. This device is more suitable for lifting and lowering the operating table column.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A two-stage, two-cylinder hydraulic device, the hydraulic device comprising: a cylinder head, a cylinder seat, an upper hydraulic cylinder, a lower hydraulic cylinder, a first oil supply pipe, a second oil supply pipe, a rodless chamber oil supply pipe, a rod chamber oil supply pipe, and a connecting rod;

[0007] An upper hydraulic cylinder, a lower hydraulic cylinder, a rodless chamber oil supply pipe, a rod chamber oil supply pipe, and a connecting rod are provided between the cylinder head and the cylinder seat; the upper hydraulic cylinder includes an upper cylinder barrel and an upper piston rod that can extend and retract within the upper cylinder barrel; the upper piston rod extends and retracts upward through the cylinder head; the lower hydraulic cylinder includes a lower cylinder barrel and a lower piston rod that can extend and retract downward through the cylinder seat;

[0008] The first oil supply pipe is connected to the rodless chamber of the upper cylinder and the rodless chamber of the lower cylinder through the rodless chamber oil passage and the rodless chamber oil supply pipe, and the second oil supply pipe is connected to the rod chamber of the upper cylinder and the rod chamber of the lower cylinder through the rod chamber oil passage and the rod chamber oil supply pipe.

[0009] Furthermore, the cylinder head is provided with an upper cylinder barrel upper clamp, a lower cylinder barrel lower clamp, a rodless chamber oil supply pipe upper clamp, and a rod chamber oil supply pipe upper clamp arranged in parallel. The upper cylinder barrel upper clamp is installed on the upper end of the upper cylinder barrel, and the lower cylinder barrel lower clamp is installed on the lower end of the lower cylinder barrel; the rodless chamber oil supply pipe upper clamp is installed on the upper end of the rodless chamber oil supply pipe, and the rod chamber oil supply pipe upper clamp is installed on the upper end of the rod chamber oil supply pipe.

[0010] The upper cylinder barrel has an upper through hole at the bottom of the upper bayonet, which is used to pass through the upper piston rod;

[0011] An oil passage for the rod chamber of the upper cylinder is provided on the side wall of the upper cylinder barrel. One end of the oil passage is connected to the rod chamber of the upper cylinder barrel, and the other end is connected to the second oil supply pipe. An oil passage for the rodless chamber of the lower cylinder is provided on the side wall of the lower cylinder barrel. One end of the oil passage is connected to the rodless chamber of the lower cylinder barrel, and the other end is connected to the first oil supply pipe.

[0012] The cylinder base is provided with an upper cylinder barrel lower clamp, a lower cylinder barrel upper clamp, a rodless chamber oil supply pipe lower clamp, and a rod chamber oil supply pipe lower clamp arranged in parallel. The lower cylinder barrel lower clamp is installed with the lower end of the upper cylinder barrel, and the upper cylinder barrel upper clamp is installed with the upper end of the lower cylinder barrel; the lower rodless chamber oil supply pipe lower clamp is installed with the lower end of the rodless chamber oil supply pipe, and the lower rod chamber oil supply pipe lower clamp is installed with the lower end of the rod chamber oil supply pipe.

[0013] A lower through hole is provided at the bottom of the upper bayonet of the lower cylinder barrel, which is used to pass through the lower piston rod;

[0014] An oil passage for the rodless chamber of the upper cylinder is provided on the side wall of the lower jaw of the upper cylinder. One end of the oil passage is connected to the rodless chamber of the upper cylinder, and the other end is connected to the first oil supply pipe. An oil passage for the rod chamber of the lower cylinder is provided on the side wall of the upper jaw of the lower cylinder. One end of the oil passage is connected to the rod chamber of the lower cylinder, and the other end is connected to the second oil supply pipe.

[0015] Preferably, there are several connecting rods, which are evenly distributed between the cylinder head and the cylinder seat to provide support.

[0016] Preferably, the connecting rod is threaded at both ends, with one end passing through the cylinder head and fixed with a nut, and the other end being fixedly connected to the internal thread of the cylinder seat.

[0017] Preferably, both the cylinder head and the cylinder seat are cuboid in shape.

[0018] Preferably, the tetrahedron shape is a cuboid shape.

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] This invention achieves parallel connection of two cylinders through an internal connection structure between the cylinder head and cylinder seat, resulting in constant output pressure and speed. This invention can be used in various applications; its overall rectangular structure adapts to the internal space of the operating table column, making it particularly practical for operating tables with square columns. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a hydraulic device with the piston rod not extended.

[0022] Figure 2 This is a schematic diagram of the piston rod extension structure of a hydraulic device;

[0023] Figure 3 This is a schematic diagram of the cylinder head structure;

[0024] Figure 4 This is a schematic diagram of the cylinder base structure;

[0025] Figure 5 This is a front view of the cylinder head;

[0026] Figure 6 This is a rear view of the cylinder head;

[0027] Figure 7 This is a schematic diagram of the hydraulic oil flow direction with oil entering from the rodless chamber and oil exiting from the rod chamber (the black dashed arrows in the diagram indicate the hydraulic oil flow direction);

[0028] Figure 8 This is an internal cross-sectional schematic diagram of the hydraulic oil flow direction in the rodless chamber (the red solid arrow in the figure indicates the hydraulic oil flow direction);

[0029] Figure 9 This is an internal cross-sectional schematic diagram of the hydraulic oil flow direction in the rod chamber (the red solid arrow in the figure indicates the hydraulic oil flow direction);

[0030] Figure 10 This is a schematic diagram of the hydraulic oil flow direction with oil entering from the rod chamber and exiting from the rodless chamber (the black dashed arrows in the diagram indicate the hydraulic oil flow direction);

[0031] Figure 11 This is an internal cross-sectional schematic diagram of the hydraulic oil flow direction in the rod chamber (the red solid arrow in the figure indicates the hydraulic oil flow direction);

[0032] Figure 12 This is an internal cross-sectional schematic diagram of the hydraulic oil flow direction in the rodless chamber (the red solid arrow in the figure indicates the hydraulic oil flow direction);

[0033] Figure label:

[0034] 1. Cylinder head; 1-1. Upper cylinder barrel upper clamp; 1-2. Lower cylinder barrel lower clamp; 1-3. Upper clamp of rodless chamber fuel line; 1-4. Upper clamp of rod chamber fuel line; 1-5. Upper cylinder barrel rod chamber fuel passage; 1-6. Lower cylinder barrel rodless chamber fuel passage; 1-7. Upper through hole; 2. Cylinder seat; 2-1. Upper cylinder barrel lower clamp; 2-2. Lower cylinder barrel upper clamp; 2-3. Lower clamp of rodless chamber fuel line; 2-4. 2-5. Lower bayonet of the rod chamber oil delivery pipe; 2-6. Lower oil delivery channel of the upper cylinder; 2-7. Upper through hole; 3. Upper hydraulic cylinder; 3-1. Upper cylinder; 3-2. Upper piston rod; 4. Lower hydraulic cylinder; 4-1. Lower cylinder; 4-2. Lower piston rod; 5. First oil delivery pipe; 6. Second oil delivery pipe; 7. Rodless chamber oil delivery pipe; 8. Rod chamber oil delivery pipe; 9. Connecting rod; 10. Threaded hole. Detailed Implementation

[0035] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] like Figure 1-2 As shown in 7 and 10, a two-stage, two-cylinder hydraulic device is provided, comprising: cylinder head 1, cylinder seat 2, upper hydraulic cylinder 3, lower hydraulic cylinder 4, first oil supply pipe 5, second oil supply pipe 6, rodless chamber oil supply pipe 7, rod chamber oil supply pipe 8, and connecting rod 9.

[0038] An upper hydraulic cylinder 3, a lower hydraulic cylinder 4, a rodless chamber oil supply pipe 7, a rod chamber oil supply pipe 8, and a connecting rod 9 are provided between the cylinder head 1 and the cylinder seat 2. The upper hydraulic cylinder 3 includes an upper cylinder barrel 3-1 and an upper piston rod 3-2 that can extend and retract within the upper cylinder barrel. The upper piston rod 3-2 extends upward through the cylinder head 1. The lower hydraulic cylinder 4 includes a lower cylinder barrel 4-1 and a lower piston rod 4-2 that can extend and retract within the lower cylinder barrel. The lower piston rod 4-2 extends downward through the cylinder seat 2.

[0039] The first oil supply pipe 5 is connected to the rodless chamber of the upper cylinder 3-1 and the rodless chamber of the lower cylinder 4-1 through the rodless chamber oil passage and the rodless chamber oil supply pipe 7. The second oil supply pipe 6 is connected to the rod chamber of the upper cylinder 3-1 and the rod chamber of the lower cylinder 4-1 through the rod chamber oil passage and the rod chamber oil supply pipe 8.

[0040] The upper cylinder 3-1 is divided into a rod chamber and a rodless chamber by the piston of the piston rod, and the lower cylinder 4-1 is divided into a rod chamber and a rodless chamber by the piston of the piston rod; the upper cylinder rod chamber oil passage 1-5 and the lower cylinder rod chamber oil passage 2-6 constitute the rod chamber oil passage; the lower cylinder rodless chamber oil passage 1-6 and the upper cylinder rodless chamber oil passage 2-5 constitute the rodless chamber oil passage.

[0041] like Figure 3 and5 As shown in Figure 6, the cylinder head 1 is provided with an upper cylinder barrel upper clamp 1-1, a lower cylinder barrel lower clamp 1-2, a rodless chamber oil pipe 7 upper clamp 1-3, and a rod chamber oil pipe 8 upper clamp 1-4 arranged in parallel. The upper cylinder barrel upper clamp 1-1 is installed on the upper end of the upper cylinder barrel 3-1, and the lower cylinder barrel lower clamp 1-2 is installed on the lower end of the lower cylinder barrel 4-1; the rodless chamber oil pipe 7 upper clamp 1-3 is installed on the upper end of the rodless chamber oil pipe 7, and the rod chamber oil pipe 8 upper clamp 1-4 is installed on the upper end of the rod chamber oil pipe 8.

[0042] The upper cylinder barrel has an upper through hole 1-7 at the bottom of the upper bayonet 1-1. The upper through hole 1-7 is used to pass through the upper piston rod 3-1.

[0043] like Figure 5-6 As shown, an upper cylinder rod chamber oil passage 1-5 is provided on the side wall of the upper cylinder upper bayonet 1-1. One end of the upper cylinder rod chamber oil passage 1-5 is connected to the upper cylinder rod chamber, and the other end is connected to the second oil supply pipe 6. A lower cylinder rodless chamber oil passage 1-6 is provided on the side wall of the lower cylinder lower bayonet 1-2. One end of the lower cylinder rodless chamber oil passage 1-6 is connected to the lower cylinder rodless chamber, and the other end is connected to the first oil supply pipe 5.

[0044] like Figure 4 As shown, the cylinder base 2 is provided with an upper cylinder barrel lower clamp 2-1, a lower cylinder barrel upper clamp 2-2, a rodless chamber oil supply pipe lower clamp 2-3, and a rod chamber oil supply pipe lower clamp 2-4 arranged side by side. The lower cylinder barrel lower clamp 2-1 is installed with the lower end of the upper cylinder barrel 3-1, and the lower cylinder barrel upper clamp 2-2 is installed with the upper end of the lower cylinder barrel 4-1. The lower rodless chamber oil supply pipe lower clamp 2-3 is installed with the lower end of the rodless chamber oil supply pipe 7, and the lower rod chamber oil supply pipe lower clamp 2-4 is installed with the lower end of the rod chamber oil supply pipe 8.

[0045] The bottom of the upper bayonet 2-2 of the lower cylinder is provided with a lower through hole 2-7, which is used to pass through the lower piston rod 4-2;

[0046] An upper cylinder rodless chamber oil passage 2-5 is provided on the side wall of the lower jaw 2-1 of the upper cylinder. One end of the upper cylinder rodless chamber oil passage 2-5 is connected to the upper cylinder rodless chamber, and the other end is connected to the first oil supply pipe 5. A lower cylinder rod chamber oil passage 2-6 is provided on the side wall of the upper jaw 2-2 of the lower cylinder. One end of the lower cylinder rod chamber oil passage 2-6 is connected to the lower cylinder rod chamber, and the other end is connected to the second oil supply pipe 6.

[0047] There are several connecting rods 9, which are evenly distributed between the cylinder head 1 and the cylinder seat 2 to provide support.

[0048] The connecting rod 9 has threads at both ends. One end passes through the cylinder head 1 and is fixed with a nut, while the other end is fixedly connected to the internal threads of the cylinder seat 2.

[0049] Both the cylinder head 1 and the cylinder seat 2 are rectangular parallelepipeds.

[0050] The working principle of this utility model:

[0051] 1. Oil enters through the first oil supply pipe and returns through the second oil supply pipe, causing the piston rod to extend:

[0052] like Figure 7-9 As shown (of which) Figure 8 It can be seen as Figure 3 and Figure 4 The section shown is in the BB direction. Figure 9 It can be seen as Figure 3 and Figure 4 (As shown in the AA direction section); as Figure 8 As shown, the oil entering from the first oil supply pipe 5 is divided into two paths. One path passes through the rodless chamber oil supply pipe 7 and the upper cylinder rodless chamber oil passage 2-5 to enter the rodless chamber of the upper cylinder 3-1, driving the upper piston rod 3-2 to extend out of the upper cylinder 3-1. The other path passes through the lower cylinder rodless chamber oil passage 1-6 to enter the rodless chamber of the lower cylinder 4-1, driving the lower piston rod 4-2 to extend out. Figure 9 As shown, during the piston rod extension process, the hydraulic oil in the rod chamber of the upper cylinder 3-1 returns to the second oil supply pipe 6 through the upper cylinder rod chamber oil passage 1-5; the hydraulic oil in the rod chamber of the lower cylinder 4-1 returns to the second oil supply pipe through the lower cylinder rod chamber oil passage 2-6 and the rod chamber oil supply pipe 8.

[0053] 2. Oil enters through the second oil supply pipe and returns through the first oil supply pipe, causing the piston rod to retract:

[0054] like Figure 10-12 As shown (of which) Figure 11 It can be seen as Figure 3 and Figure 4 The section shown is in the AA direction. Figure 12 It can be seen as Figure 3 and Figure 4 (The BB direction section is shown in the figure). Figure 11 As shown, the oil inlet from the second oil supply pipe 6 is divided into two paths. One path enters the rod chamber of the upper cylinder 3-1 through the rod chamber oil passage 1-5 of the upper cylinder, driving the upper piston rod 3-2 to retract into the upper cylinder 3-1. The other path enters the rod chamber of the lower cylinder 4-1 through the rod chamber oil supply pipe 8 and the rod chamber oil passage 2-6 of the lower cylinder, driving the lower piston rod 4-2 to retract into the lower cylinder 4-1.

[0055] like Figure 12 As shown, during the piston rod retraction process, the hydraulic oil in the rodless chamber of the upper cylinder 3-1 returns to the first oil supply pipe 5 via the upper cylinder rodless chamber oil passage 2-5 and the rodless chamber oil supply pipe 7; the hydraulic oil in the rodless chamber of the lower cylinder 4-1 returns to the second oil supply pipe 6 via the lower cylinder rodless chamber oil passage 1-6.

[0056] The two cylinders of this invention are the same size, which ensures that the pressure and speed of the two piston rods remain constant when they extend, resulting in smoother operation.

[0057] Both hydraulic cylinders of this invention can extend their rods, and the two piston rods are not concentric. The overall shape of the hydraulic cylinders is rectangular, which is more suitable for the internal space of the operating table column.

[0058] Ordinary two-stage hydraulic cylinders can achieve relatively low height dimensions and large-scale lifting. However, since the first and second stage hydraulic cylinders are connected in series with different cylinder diameters and piston sizes, when switching to the second stage hydraulic cylinder after the first stage has fully extended, the piston area decreases sharply, resulting in reduced output pressure, slower speed, and lower load-bearing capacity. The hydraulic device provided by this utility model does not have this problem. The two hydraulic cylinders in this device have the same cylinder diameter and equal piston area, which can ensure that the output pressure remains stable and the operating speed remains constant. Moreover, it can maximize space utilization within a square column cylinder.

[0059] For any content not described in detail in this utility model, conventional technical knowledge in the field can be used.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A two-stage, two-cylinder hydraulic device, characterized in that, The hydraulic device includes: a cylinder head, a cylinder seat, an upper hydraulic cylinder, a lower hydraulic cylinder, a first oil supply pipe, a second oil supply pipe, a rodless chamber oil supply pipe, a rod chamber oil supply pipe, and a connecting rod; An upper hydraulic cylinder, a lower hydraulic cylinder, a rodless chamber oil supply pipe, a rod chamber oil supply pipe, and a connecting rod are provided between the cylinder head and the cylinder seat; the upper hydraulic cylinder includes an upper cylinder barrel and an upper piston rod that can extend and retract within the upper cylinder barrel; the upper piston rod extends and retracts upward through the cylinder head; the lower hydraulic cylinder includes a lower cylinder barrel and a lower piston rod that can extend and retract downward through the cylinder seat; The first oil supply pipe is connected to the rodless chamber of the upper cylinder and the rodless chamber of the lower cylinder through the rodless chamber oil passage and the rodless chamber oil supply pipe, and the second oil supply pipe is connected to the rod chamber of the upper cylinder and the rod chamber of the lower cylinder through the rod chamber oil passage and the rod chamber oil supply pipe.

2. The dual-stage, dual-cylinder hydraulic device according to claim 1, characterized in that, The cylinder head is provided with an upper cylinder barrel upper clamp, a lower cylinder barrel lower clamp, a rodless chamber oil supply pipe upper clamp, and a rod chamber oil supply pipe upper clamp arranged side by side. The upper cylinder barrel upper clamp is installed on the upper end of the upper cylinder barrel, and the lower cylinder barrel lower clamp is installed on the lower end of the lower cylinder barrel; the rodless chamber oil supply pipe upper clamp is installed on the upper end of the rodless chamber oil supply pipe, and the rod chamber oil supply pipe upper clamp is installed on the upper end of the rod chamber oil supply pipe. The upper cylinder barrel has an upper through hole at the bottom of the upper bayonet, which is used to pass through the upper piston rod; An oil passage for the rod chamber of the upper cylinder is provided on the side wall of the upper cylinder barrel. One end of the oil passage is connected to the rod chamber of the upper cylinder barrel, and the other end is connected to the second oil supply pipe. An oil passage for the rodless chamber of the lower cylinder is provided on the side wall of the lower cylinder barrel. One end of the oil passage is connected to the rodless chamber of the lower cylinder barrel, and the other end is connected to the first oil supply pipe. The cylinder base is provided with an upper cylinder barrel lower clamp, a lower cylinder barrel upper clamp, a rodless chamber oil supply pipe lower clamp, and a rod chamber oil supply pipe lower clamp arranged in parallel. The lower cylinder barrel lower clamp is installed with the lower end of the upper cylinder barrel, and the upper cylinder barrel upper clamp is installed with the upper end of the lower cylinder barrel; the lower rodless chamber oil supply pipe lower clamp is installed with the lower end of the rodless chamber oil supply pipe, and the lower rod chamber oil supply pipe lower clamp is installed with the lower end of the rod chamber oil supply pipe. A lower through hole is provided at the bottom of the upper bayonet of the lower cylinder barrel, which is used to pass through the lower piston rod; An oil passage for the rodless chamber of the upper cylinder is provided on the side wall of the lower jaw of the upper cylinder. One end of the oil passage is connected to the rodless chamber of the upper cylinder, and the other end is connected to the first oil supply pipe. An oil passage for the rod chamber of the lower cylinder is provided on the side wall of the upper jaw of the lower cylinder. One end of the oil passage is connected to the rod chamber of the lower cylinder, and the other end is connected to the second oil supply pipe.

3. The dual-stage, dual-cylinder hydraulic device according to claim 1, characterized in that, There are several connecting rods, which are evenly distributed between the cylinder head and the cylinder seat to provide support.

4. The dual-stage, dual-cylinder hydraulic device according to claim 3, characterized in that, The connecting rod is threaded at both ends. One end passes through the cylinder head and is fixed with a nut, while the other end is fixedly connected to the internal thread of the cylinder seat.

5. The dual-stage, dual-cylinder hydraulic device according to claim 1, characterized in that, Both the cylinder head and cylinder seat are cuboid in shape.

6. The dual-stage, dual-cylinder hydraulic device according to claim 5, characterized in that, The tetrahedron shape is a cuboid shape.

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