Parallel oil way system of double-column lifting machine

Abstract

The utility model relates to the technical field of double-column lifting machines, in particular to a parallel oil way system of a double-column lifting machine. The double-column lifting machine comprises a base assembly, a first stand column, a second stand column, a sliding assembly, a lifting arm, a hydraulic cylinder and the like, a parallel oil way system is arranged at the bottom end of the double-column lifting machine and comprises a conveying pipe, the conveying pipe penetrates through the base assembly, and the first stand column and the second stand column are connected through the sliding assembly. The two ends of the conveying pipe communicate with the oil inlet ends of the first hydraulic cylinder and the second hydraulic cylinder correspondingly. A plurality of throttle valves with the joint direction being forward throttling are arranged on the conveying pipe trunk, and a branch is provided with a fourth throttle valve for forward throttling in parallel; the fourth throttling valve communicates with the first hydraulic cylinder. An original series oil way system is improved into a parallel oil way system, synchronism of the first hydraulic cylinder and the second hydraulic cylinder is guaranteed, the sliding assembly and the lifting arm are driven to ascend and descend synchronously, and the use safety performance of the double-column lifting machine is improved.

Description

Technical Field

[0001] This utility model relates to the field of two-post lift technology, specifically a parallel hydraulic circuit system for a two-post lift. Background Technology

[0002] A two-post lift is a device used to lift vehicles during vehicle repair. The vehicle is driven to the lift bay, and manual operation raises it to a certain height for easier repair. The lift uses a sliding mechanism and a lifting mechanism to raise and lower the vehicle. However, there are many safety hazards during vehicle lifting, such as deformation or breakage of the column or lifting arm leading to the vehicle falling, and slippage of the vehicle pallet. These potential factors seriously affect the personal safety of repair personnel and can lead to vehicle damage or even total loss.

[0003] Lifts can be classified into mechanical and hydraulic transmission types based on their transmission method. Hydraulic lifts require a combination of an oil circuit system, hydraulic cylinders, and an oil pump to achieve lifting. To enhance safety, throttle valves are typically installed at the joints in the oil circuit system. However, because the two columns of a two-post lift are connected in series, and the joints are often generic, one joint in the oil circuit system will always be throttling in the reverse direction. This causes the sliding mechanism and lifting mechanism on the two columns to move asynchronously, significantly increasing the safety risks associated with lifting. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a parallel hydraulic circuit system for a two-post lift. The purpose is to improve the original series hydraulic circuit system into a parallel hydraulic circuit system, ensuring the synchronization of hydraulic cylinder one and hydraulic cylinder two, thereby driving the sliding components and lifting arm to rise and fall synchronously, and improving the safety performance of the two-post lift.

[0005] To achieve the above objectives, this utility model provides a parallel hydraulic circuit system for a two-post lift. The two-post lift includes a base assembly; a first post and a second post are provided at the top of both sides of the base assembly; sliding components are slidably provided on the first post and the second post respectively, and a sliding table is provided at the bottom of the sliding component; a lifting arm is hinged to the sliding table; a hydraulic oil pump is fixed to the outside of the first post; a hydraulic cylinder one and a hydraulic cylinder two are respectively provided inside the first post and the second post.

[0006] The bottom of the two-post lift is equipped with a parallel hydraulic circuit system. This system includes a delivery pipe that penetrates the base assembly, with both ends connected to the inlet of hydraulic cylinder one and hydraulic cylinder two, respectively. The main branch of the delivery pipe is equipped with multiple throttle valves with positive throttling connections, and a fourth throttle valve with positive throttling is connected in parallel on its branches. The fourth throttle valve is connected to hydraulic cylinder one. By providing this parallel hydraulic circuit system penetrating both ends of the base assembly at the bottom of the two-post lift, hydraulic oil can simultaneously pass through the throttle valves with positive throttling direction and enter both hydraulic cylinders one and two. This ensures that hydraulic cylinders one and two move synchronously, driving the sliding assembly and lifting arm to rise and fall synchronously, thus improving the safety performance of the two-post lift.

[0007] Furthermore, the main inlet end of the conveying pipe is sequentially equipped with throttle valve one, throttle valve two, and throttle valve three; throttle valve one and throttle valve two are located on one side of the first column, and throttle valve three is located on one side of the second column; throttle valve one and throttle valve three are in the forward throttle direction, and throttle valve two is in the reverse throttle direction; a three-way connector is connected between throttle valve one and throttle valve two, and a throttle valve four is installed at one end of the three-way connector. Throttle valve one controls the flow rate and direction of the hydraulic oil in the entire conveying pipe; throttle valve three is in the forward throttle direction and is used to control the flow rate and direction of the hydraulic oil in hydraulic cylinder two; throttle valve two can throttle hydraulic cylinder one, but since throttle valve two is in the reverse throttle direction, the throttle effect is less than that in the forward throttle direction. Therefore, a forward throttle valve four is connected in parallel between throttle valve one and throttle valve two, thereby achieving the synchronous movement of hydraulic cylinder one and hydraulic cylinder two.

[0008] Furthermore, the throttle valve includes a valve body, a cavity, an oil inlet, and an oil outlet. The cavity is internally connected to the valve body, and an oil inlet is located on the side wall of the valve body, connecting to the cavity. The tee connector delivers hydraulic oil to the oil inlet. An oil outlet is located at the end of the cavity furthest from the oil inlet. Hydraulic oil flows into the inlet via the tee connector, circulates within the cavity, and finally flows out through the outlet into the hydraulic cylinder. The hydraulic cylinder converts hydraulic energy into mechanical energy and reciprocates linearly along the column, thereby driving the sliding assembly and lifting arm to move up and down.

[0009] Furthermore, an adjusting handwheel is welded to the valve body at the end furthest from the oil outlet; a valve body sleeve is rotatably fitted onto the outer wall of the valve body, and the outer wall of the valve body sleeve has an opening of the same size as the oil inlet; the valve body sleeve covers the oil inlet; a pair of positioning rings are fixedly installed on both sides of the valve body sleeve. When the adjusting handwheel is manually adjusted, the adjusting handwheel drives the valve body to rotate. When the valve body rotates to the position where the oil inlet coincides with the opening of the valve body sleeve, the throttle valve is in the open state, and the flow rate of hydraulic oil entering the cavity is large. Manually rotating the adjusting handwheel can adjust the flow rate of hydraulic oil flowing into the oil inlet, thereby achieving flow control; the positioning rings are used to fix the two sides of the valve body sleeve to the outer wall of the valve body to prevent the valve body sleeve from shifting.

[0010] Furthermore, the cavity includes an oil inlet cavity and a throttling cavity; the oil inlet cavity and the throttling cavity are connected; the diameters of the oil inlet cavity and the throttling cavity are different, and a connecting angle is formed at the connection point between the oil inlet cavity and the throttling cavity. After the hydraulic oil enters the oil inlet cavity from the oil inlet port, it flows into the throttling cavity through the throttling action of the throttling valve, and finally flows out from the oil outlet port into the hydraulic cylinder.

[0011] Furthermore, an adjusting spring is axially arranged inside the throttling cavity; a valve core is inserted through the adjusting spring, and the head of the valve core is arrow-shaped; the head of the valve core extends into the oil inlet cavity; a spring limiting ring is arranged in the cavity away from the valve core. By adjusting the coordination of the spring, valve core, and cavity, the throttling valve can achieve hydraulic oil flow control. The arrow-shaped head of the valve core makes flow adjustment more intuitive, reduces the fit tolerance between moving parts, and can automatically compensate for wear caused by long-term impact forces on the valve core; the spring limiting ring limits the limit compression distance of the adjusting spring and the limit movement distance of the valve core.

[0012] Furthermore, the valve core includes an arrow section and a cylindrical section; the arrow section extends outside the adjusting spring; the two sides of the rear end of the arrow section abut against the adjusting spring; when the adjusting spring is in its natural state, the two sides of the front end of the arrow section abut against the connecting corner; the cylindrical section passes through the adjusting spring; and the valve core has a throttling channel in the middle for the hydraulic oil to pass through.

[0013] When the throttle valve connector is in the positive direction, after the hydraulic oil flows into the inlet cavity, the valve core is subjected to the impact force of the hydraulic oil, and the arrow segment moves towards the throttle cavity. The adjusting spring is compressed, and there is a gap between the two sides of the arrow segment and the throttle cavity. Part of the hydraulic oil flows into the throttle cavity from the throttle channel, and part of the hydraulic oil flows into the throttle cavity from the gaps on both sides of the arrow segment, resulting in an increase in the hydraulic oil flow rate.

[0014] When the throttle valve connector is in the reverse direction, hydraulic oil flows into the cavity from the outlet. The cylindrical section is subjected to the pressure of the hydraulic oil, and the valve core moves in the direction of hydraulic oil flow. At this time, the two sides of the front end of the arrow section abut against the connecting corner, and the hydraulic oil can only flow into the inlet cavity from the throttle channel and finally flow out from the inlet, resulting in a reduction in hydraulic oil flow.

[0015] Specifically, throttle valve one, throttle valve two, throttle valve three, and throttle valve four have similar internal structures and similar flow control principles.

[0016] Furthermore, the conveying pipe is equipped with multiple connectors. These connectors can connect bends to straight pipes to accommodate the distribution of the conveying pipes on the actual site.

[0017] Furthermore, an oil pipe cover is fitted over the outside of the conveying pipe located between the first and second columns. The oil pipe cover serves to protect the conveying pipe and prevent it from being exposed to the ground for extended periods.

[0018] Furthermore, a first base plate is provided at the bottom of the first column, and a second base plate is provided at the bottom of the second column; the two ends of the conveying pipe are respectively located above the first base plate and the second base plate.

[0019] Furthermore, the lifting arm includes a first lifting arm, a second lifting arm, a third lifting arm, and a fourth lifting arm; the first and second lifting arms are rotatably mounted on the first base plate, and the third and fourth lifting arms are rotatably mounted on the second base plate.

[0020] Beneficial effects

[0021] This invention improves the original series hydraulic circuit system into a parallel hydraulic circuit system by connecting a throttle valve four with a positive throttling direction in parallel to the original hydraulic circuit system. This makes the joint directions of throttle valve one, throttle valve three, and throttle valve four consistent, allowing hydraulic oil to simultaneously pass through throttle valve four and throttle valve three and flow into hydraulic cylinder one and hydraulic cylinder two. This ensures that hydraulic cylinder one and hydraulic cylinder two can move synchronously, driving the sliding components and lifting arm to rise and fall synchronously, thus improving the safety performance of the two-post lift.

[0022] By using a combination of a cavity, adjusting spring, arrow section, cylindrical section, throttling channel, spring limit block, valve body outer sleeve, adjusting handwheel, oil inlet and oil outlet, the flow control of hydraulic oil is achieved. The throttling valve has a simple structure, strong practicality, and good throttling effect. Attached Figure Description

[0023] Figure 1 and Figure 2 This is a schematic diagram of the overall structure of a two-post lift.

[0024] Figure 3 for Figure 2 Schematic diagram of the AA section;

[0025] Figure 4 for Figure 3 Enlarged diagram of A in the middle;

[0026] Figure 5 for Figure 3 Enlarged diagram of B in the diagram;

[0027] Figure 6 This is a schematic diagram of the series oil circuit system in this embodiment;

[0028] Figure 7 for Figure 6 Schematic diagram of the BB section;

[0029] Figure 8 for Figure 7 Enlarged diagram of C in the middle;

[0030] Figure 9 This is a schematic diagram of the overall structure of the parallel oil circuit system;

[0031] Figure 10 for Figure 9 Enlarged solid image of D;

[0032] Figure 11 This is a schematic diagram of the structure of throttle valve four;

[0033] Figure 12 for Figure 11 Schematic diagram of the CC section.

[0034] In the attached diagram: 1. Base assembly; 11. First base plate; 12. Second base plate; 13. Oil pipe cover; 2. First column; 3. Second column; 4. Sliding assembly; 41. Slide table; 5. Lifting arm; 51. First lifting arm; 52. Second lifting arm; 53. Third lifting arm; 54. Fourth lifting arm; 61. Hydraulic oil pump; 62. Hydraulic cylinder one; 63. Hydraulic cylinder two; 7. Parallel oil circuit system; 71. Delivery pipe; 711. Connector; 72. T-joint; 7 3. Throttling valve one; 74. Throttling valve two; 75. Throttling valve three; 76. Throttling valve four; 761. Valve body; 762. Valve body outer sleeve; 763. Positioning ring; 764. Cavity; 7641. Oil inlet cavity; 7642. Throttling cavity; 765. Oil inlet; 766. Oil outlet; 767. Adjusting spring; 768. Valve core; 7681. Arrow section; 7682. Cylindrical section; 7683. Throttling channel; 769. Adjusting handwheel; 7610. Spring limit ring. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. The embodiments described below are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0036] Please see Figures 1-12 As shown, this utility model provides a technical solution.

[0037] In some embodiments, please refer to Figures 6 to 8 The dual-post lift has a series hydraulic circuit system. The dual-post lift includes a base assembly 1; a first column 2 and a second column 3 are provided at the top of both sides of the base assembly 1; sliding components 4 are slidably mounted on the first column 2 and the second column 3 respectively, and a sliding platform 41 is provided at the bottom of the sliding component 4; a lifting arm 5 is hinged to the sliding platform 41; a hydraulic pump 61 is fixed to the outside of the first column 2; a hydraulic cylinder 62 and a hydraulic cylinder 63 are respectively provided inside the first column 2 and the second column 3; a parallel hydraulic circuit system 7 is provided at the bottom of the dual-post lift, the parallel hydraulic circuit system 7 includes a delivery pipe 71, the delivery pipe 71 passes through the base assembly 1, and both ends of the delivery pipe 71 are respectively connected to the oil inlet ends of the hydraulic cylinder 62 and the hydraulic cylinder 63; a throttle valve is sequentially provided at the inlet end of the delivery pipe 71. 73. Throttling valve 2 74 and throttle valve 3 75; Throttling valve 2 74 controls the hydraulic oil flow rate of hydraulic cylinder 1 62, and throttle valve 3 75 controls the hydraulic oil flow rate of hydraulic cylinder 2 63; Throttling valve 1 73 and throttle valve 3 75 have the same connector direction and are in the positive throttling direction. When the hydraulic oil passes through throttle valve 3 75 with positive throttling, the flow rate is large, resulting in a fast lifting speed of sliding component 4 and lifting arm 5 on the second column 3; Throttling valve 2 74 has the opposite connector direction to throttle valve 3 75. When the hydraulic oil passes through throttle valve 2 74 with reverse throttling, the throttling effect is weakened and the flow rate is small, resulting in a slow lifting speed of sliding component 4 and lifting arm 5 on the first column 2. Ultimately, this leads to asynchronous lifting of sliding component 4 and lifting arm 5 on the first column 2 and the second column 3, increasing the safety hazard.

[0038] In this embodiment, a parallel hydraulic circuit system for a two-post lift is provided. The two-post lift includes a base assembly 1. A first column 2 and a second column 3 are provided at the top of both sides of the base assembly 1. Sliding components 4 are slidably provided on the first column 2 and the second column 3 respectively. A sliding table 41 is provided at the bottom of the sliding component 4. A lifting arm 5 is hinged on the sliding table 41. A hydraulic oil pump 61 is fixed on the outside of the first column 2. A hydraulic cylinder 62 and a hydraulic cylinder 63 are respectively provided inside the first column 2 and the second column 3. Specifically, the structural features of the sliding component 4, the hydraulic cylinder 62, and the hydraulic cylinder 63 have been disclosed in other patent documents of this company. Since they are used here without modification, their working principle will not be described in detail.

[0039] In this embodiment, a parallel hydraulic circuit system 7 is provided at the bottom of the two-post lift. The parallel hydraulic circuit system 7 includes a delivery pipe 71, which passes through the base assembly 1, and its two ends are respectively connected to the oil inlet ends of hydraulic cylinder 62 and hydraulic cylinder 63. The main branch of the delivery pipe 71 is provided with multiple throttle valves with positive throttling direction, and a fourth throttle valve 76 with positive throttling direction is provided in parallel on the branches. The fourth throttle valve 76 is connected to hydraulic cylinder 62. By providing a parallel hydraulic circuit system 7 that passes through both ends of the base assembly 1 at the bottom of the two-post lift, hydraulic oil can simultaneously pass through the throttle valves with positive throttling direction and enter hydraulic cylinders 62 and 63 simultaneously, ensuring that hydraulic cylinders 62 and 63 can move synchronously, driving the sliding assembly 4 and the lifting arm 5 to rise and fall synchronously, thereby improving the safety performance of the two-post lift.

[0040] In this embodiment, preferably, the main inlet end of the conveying pipe 71 is sequentially provided with a first throttling valve 73, a second throttling valve 74, and a third throttling valve 75; the first throttling valve 73 and the second throttling valve 74 are located on one side of the first column 2, and the third throttling valve 75 is located on one side of the second column 3; the first throttling valve 73 and the third throttling valve 75 are in the positive throttling direction, and the second throttling valve 74 is in the reverse throttling direction; a three-way connector 72 is connected between the first throttling valve 73 and the second throttling valve 74, and a fourth throttling valve 76 is provided at one end of the three-way connector 72. Throttle valve 1 73 controls the flow and direction of hydraulic oil in the entire delivery pipe 71; throttle valve 3 75 is a forward throttle valve used to control the flow and direction of hydraulic oil in hydraulic cylinder 2 63; throttle valve 2 74 can throttle hydraulic cylinder 1 62, but since throttle valve 2 74 is a reverse throttle valve, its throttle effect is less than that of forward throttle valve. Therefore, a forward throttle valve 4 76 is connected in parallel between throttle valve 1 73 and throttle valve 2 74 to achieve synchronous movement of hydraulic cylinder 1 62 and hydraulic cylinder 2 63.

[0041] In this embodiment, preferably, the throttle valve 76 includes a valve body 761, a cavity 764, an oil inlet 765, and an oil outlet 766. The cavity 764 is internally disposed within the valve body 761, and the oil inlet 765 is provided on the side wall of the valve body 761, connecting the cavity 764. The three-way connector 72 delivers hydraulic oil to the oil inlet 765. The oil outlet 766 is provided at the end of the cavity 764 away from the oil inlet 765. The hydraulic oil is connected to the oil inlet 765 through the three-way connector 72. After flowing into the oil inlet 765, the hydraulic oil circulates inside the cavity 764 and finally flows out through the oil outlet 766 into the hydraulic cylinder. The hydraulic cylinder converts hydraulic energy into mechanical energy and moves linearly back and forth along the column, thereby driving the sliding component 4 and the lifting arm 5 to move up and down.

[0042] In this embodiment, preferably, an adjusting handwheel 769 is welded to the valve body 761 at the end away from the oil outlet 766; a valve body sleeve 762 is rotatably fitted onto the outer wall of the valve body 761, and the outer wall of the valve body sleeve 762 has an opening of the same size as the oil inlet 765; the valve body sleeve 762 covers the oil inlet 765; a pair of positioning rings 763 are fixedly provided on both sides of the valve body sleeve 762. When the adjusting handwheel 769 is manually adjusted, the adjusting handwheel 769 drives the valve body 761 to rotate. When the valve body 761 rotates to the position where the oil inlet 765 coincides with the opening of the valve body sleeve 762, the throttle valve is in the open state, and the flow rate of hydraulic oil entering the cavity 764 is large. The flow rate of hydraulic oil into the inlet 765 can be adjusted by manually rotating the adjustment handwheel 769, thereby achieving flow control; the positioning ring 763 is used to fix the two sides of the valve body sleeve 762 to the outer wall of the valve body 761 to prevent the valve body sleeve 762 from being misaligned.

[0043] In this embodiment, preferably, the cavity 764 includes an oil inlet cavity 7641 and a throttling cavity 7642; the oil inlet cavity 7641 and the throttling cavity 7642 are connected; the diameters of the oil inlet cavity 7641 and the throttling cavity 7642 are different, and a connecting angle is formed at the connection point of the oil inlet cavity 7641 and the throttling cavity 7642. After the hydraulic oil enters the oil inlet cavity 7641 from the oil inlet 765, it flows into the throttling cavity 7642 through the throttling action of the throttling valve, and finally flows out into the hydraulic cylinder from the oil outlet 766.

[0044] In this embodiment, preferably, an adjusting spring 767 is axially arranged inside the throttling cavity 7642; a valve core 768 is inserted through the adjusting spring 767, and the head end of the valve core 768 is arrow-shaped; the head end of the valve core 768 extends towards the oil inlet cavity 7641; a spring limiting ring 7610 is arranged in the cavity 764 away from the valve core 768. By adjusting the coordinated arrangement of the adjusting spring 767, valve core 768, and cavity 764, the throttling valve can achieve hydraulic oil flow control. The arrow-shaped head end of the valve core 768 makes flow adjustment more intuitive, reduces the fit tolerance between moving parts, and can automatically compensate for the wear of the valve core 768 caused by long-term impact forces; the spring limiting ring 7610 limits the limit compression distance of the adjusting spring 767 and the limit movement distance of the valve core 768.

[0045] In this embodiment, preferably, the valve core 768 includes an arrow segment 7681 and a cylindrical segment 7682; the arrow segment 7681 extends outside the adjusting spring 767; the two sides of the rear end of the arrow segment 7681 abut against the adjusting spring 767; when the adjusting spring 767 is in its natural state, the two sides of the front end of the arrow segment 7681 abut against the connecting corner; the cylindrical segment 7682 passes through the adjusting spring 767; the valve core 768 has a throttling channel 7683 in the middle for the hydraulic oil to pass through.

[0046] When the throttle valve connector is in the positive direction, after the hydraulic oil flows into the inlet cavity 7641, the valve core 768 is subjected to the impact force of the hydraulic oil, and the arrow segment 7681 moves towards the throttle cavity 7642. The adjusting spring 767 is compressed, and there is a gap between the two sides of the arrow segment 7681 and the throttle cavity 7642. Part of the hydraulic oil flows into the throttle cavity 7642 from the throttle channel 7683, and part of the hydraulic oil flows into the throttle cavity 7642 from the gaps on both sides of the arrow segment 7681, resulting in an increase in the hydraulic oil flow rate.

[0047] When the throttle valve connector is in the reverse direction, hydraulic oil flows from the outlet 766 into the cavity 764. The cylindrical section 7682 is subjected to the pressure of the hydraulic oil, and the valve core 768 moves in the direction of hydraulic oil flow. At this time, the two sides of the front end of the arrow section 7681 abut against the connecting corner, and the hydraulic oil can only flow from the throttle channel 7683 into the inlet cavity 7641, and finally flow out from the inlet 765, resulting in a reduction in hydraulic oil flow.

[0048] Specifically, throttle valve 1 (73), throttle valve 2 (74), throttle valve 3 (75), and throttle valve 4 (76) have similar internal structures and similar flow control principles.

[0049] In this embodiment, preferably, the conveying pipe 71 is provided with a plurality of connectors 711. The connectors 711 can connect the bends to the straight pipes to meet the distribution and arrangement of the conveying pipes 71 on the actual site.

[0050] In this embodiment, preferably, an oil pipe cover plate 13 is fitted over the outside of the conveying pipe 71 located between the first column 2 and the second column 3. The oil pipe cover plate 13 serves to protect the conveying pipe 71 and prevent it from being exposed to the ground for a long time.

[0051] In this embodiment, preferably, the bottom of the first column 2 is provided with a first base plate 11, and the bottom of the second column 3 is provided with a second base plate 12; the two ends of the conveying pipe 71 are respectively located above the first base plate 11 and the second base plate 12.

[0052] In this embodiment, preferably, the lifting arm 5 includes a first lifting arm 51, a second lifting arm 52, a third lifting arm 53, and a fourth lifting arm 54; the first lifting arm 51 and the second lifting arm 52 are rotatably mounted on the first base plate 11, and the third lifting arm 53 and the fourth lifting arm 54 are rotatably mounted on the second base plate 12.

[0053] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A parallel hydraulic circuit system for a two-post lift, characterized in that: The dual-post lift includes a base assembly (1); a first post (2) and a second post (3) are provided at the top of both sides of the base assembly (1); a sliding component (4) is slidably provided on the first post (2) and the second post (3), and a slide table (41) is provided at the bottom of the sliding component (4); a lifting arm (5) is hinged on the slide table (41); a hydraulic oil pump (61) is fixed on the outside of the first post (2); a hydraulic cylinder one (62) and a hydraulic cylinder two (63) are respectively provided inside the first post (2) and the second post (3); The bottom end of the double-column lift is provided with a parallel oil circuit system (7), which includes a delivery pipe (71). The delivery pipe (71) passes through the base assembly (1), and the two ends of the delivery pipe (71) are respectively connected to the oil inlet of hydraulic cylinder one (62) and hydraulic cylinder two (63). The main body of the delivery pipe (71) is provided with multiple throttle valves with positive throttling direction, and the branches are provided with positive throttling valve four (76) in parallel. The throttle valve four (76) is connected to hydraulic cylinder one (62).

2. The parallel hydraulic circuit system of the twin-post lift according to claim 1, characterized in that: The main inlet end of the conveying pipe (71) is provided with throttle valve one (73), throttle valve two (74), and throttle valve three (75) in sequence; throttle valve one (73) and throttle valve two (74) are located on one side of the first column (2), and throttle valve three (75) is located on one side of the second column (3); throttle valve one (73) and throttle valve three (75) are in the positive throttle direction, and throttle valve two (74) is in the reverse throttle direction; a three-way connector (72) is connected between throttle valve one (73) and throttle valve two (74), and a throttle valve four (76) is provided at one end of the three-way connector (72).

3. The parallel hydraulic circuit system of the twin-post lift according to claim 2, characterized in that: The throttle valve (76) includes a valve body (761), a cavity (764), an oil inlet (765), and an oil outlet (766); the cavity (764) is provided through the inside of the valve body (761), and the oil inlet (765) is provided on the side wall of the valve body (761), and the oil inlet (765) is connected to the cavity (764); the three-way connector (72) delivers hydraulic oil to the oil inlet (765); the oil outlet (766) is provided at the end of the cavity (764) away from the oil inlet (765).

4. The parallel hydraulic circuit system of the twin-post lift according to claim 3, characterized in that: An adjusting handwheel (769) is welded to the valve body (761) at the end away from the oil outlet (766); a valve body sleeve (762) is rotatably fitted on the outer wall of the valve body (761), and the outer wall of the valve body sleeve (762) has an opening with the same size as the oil inlet (765); the valve body sleeve (762) covers the oil inlet (765); a pair of positioning rings (763) are fixedly provided on both sides of the valve body sleeve (762).

5. The parallel hydraulic circuit system of the twin-post lift according to claim 3, characterized in that: The cavity (764) includes an oil inlet cavity (7641) and a throttling cavity (7642); the oil inlet cavity (7641) and the throttling cavity (7642) are connected; the diameters of the oil inlet cavity (7641) and the throttling cavity (7642) are different, and a connecting angle is formed at the connection between the oil inlet cavity (7641) and the throttling cavity (7642).

6. The parallel hydraulic circuit system of the two-post lift according to claim 5, characterized in that: An adjusting spring (767) is axially arranged inside the throttling cavity (7642); a valve core (768) is inserted through the adjusting spring (767), and the head end of the valve core (768) is arrow-shaped; the head end of the valve core (768) extends toward the oil inlet cavity (7641); a spring limiting ring (7610) is arranged in the throttling cavity (7642) away from the valve core (768).

7. The parallel hydraulic circuit system of the twin-post lift according to claim 6, characterized in that: The valve core (768) includes an arrow section (7681) and a cylindrical section (7682); the arrow section (7681) extends outside the adjusting spring (767); the two sides of the rear end of the arrow section (7681) abut against the adjusting spring (767); when the adjusting spring (767) is in its natural state, the two sides of the front end of the arrow section (7681) abut against the connecting corner; the cylindrical section (7682) passes through the adjusting spring (767); the valve core (768) has a throttling channel (7683) in the middle of its interior for the hydraulic oil to pass through.

8. The parallel hydraulic circuit system of the twin-post lift according to claim 1, characterized in that: The delivery pipe (71) is provided with multiple connectors (711).

9. The parallel hydraulic circuit system of the twin-post lift according to claim 1, characterized in that: An oil pipe cover plate (13) is fitted over the outside of the delivery pipe (71) located between the first column (2) and the second column (3).

10. The parallel hydraulic circuit system of the twin-post lift according to claim 1, characterized in that: The first column (2) is provided with a first base plate (11) at its bottom, and the second column (3) is provided with a second base plate (12) at its bottom; the two ends of the conveying pipe (71) are respectively located above the first base plate (11) and the second base plate (12).

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