Walking hydraulic system and scissor lift work platform

Abstract

This invention discloses a walking hydraulic system and a scissor lift work platform. The system includes a hydraulic oil tank, an oil pump, a first motor and a second motor, a first electromagnetic directional valve, a second electromagnetic directional valve, a third electromagnetic directional valve, a fourth electromagnetic directional valve, a first balance valve and a second balance valve, and a flow divider / combiner valve. This invention replaces the original two-position four-way electromagnetic directional valve with a third electromagnetic directional valve and a fourth electromagnetic directional valve, and adds a flow divider / combiner valve to ensure the average flow distribution between the two motors during low-speed walking, solving the problems of inability to travel long distances in a straight line and easy slippage and lack of power during low-speed walking. The flow divider / combiner valve's collection port is connected in parallel with the second electromagnetic directional valve, allowing the oil circuit to be switched through the second electromagnetic directional valve without passing through the flow divider / combiner valve, solving the problem of high system pressure and high energy consumption caused by oil flowing through the flow divider / combiner valve during high-speed walking.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic drive technology, and particularly relates to a walking hydraulic system and a scissor lift work platform. Background Technology

[0002] A self-propelled scissor lift is a common type of specialized aerial work platform. Its main functions include lifting, traveling, braking, and steering. Two motors are mounted on the left and right front wheels, and two brakes are mounted on the left and right rear wheels. The steering cylinder is mounted at the front of the platform's base frame, thus forming a front-wheel drive system with steering and rear-wheel braking. Figure 1 and Figure 2 As shown, the existing walking hydraulic system mainly includes: a three-position four-way solenoid directional valve, two balance valves, a two-position four-way solenoid directional valve, a replenishing check valve, and a motor. The three-position four-way solenoid directional valve is used to control the forward or backward movement of the work platform, the two balance valves are used to maintain a certain back pressure, the two-position four-way solenoid directional valve is used to switch between high and low speeds (i.e., switch between series and parallel motors), the replenishing check valve is used to replenish the extra oil needed by the motor, and the motor is used to drive the tires to rotate.

[0003] In recent years, with the rapid growth of the market for self-propelled scissor lift work platforms, users have increasingly higher requirements for the performance and reliability of these platforms after long-term and extensive use. However, the existing hydraulic systems for self-propelled scissor lift work platforms have the following defects:

[0004] (1) Some road surfaces cannot be traversed at low speed: The existing work platform's wheel frame is a rigid structure without floating or other adjustment functions. When encountering potholes or slopes, the low-speed travel causes its own inertia to prevent it from passing through potholes or slopes. At this time, three tires support the entire work platform, with one tire suspended in the air. When the suspended tire is one of the two front wheels, most of the oil output by the oil pump flows through the motor with low load (i.e., the motor on the suspended front wheel), resulting in less oil on the motor on the non-suspended front wheel, which cannot build up pressure. Consequently, the torque output by the motor is very small and cannot drive the entire work platform to move, thus making it impossible to pass through roads with potholes or slopes.

[0005] (2) Low-speed walking cannot travel long distances in a straight line: When the road surface is uneven, the loads of the two motors are different, resulting in different oil flow rates to the two motors, different motor speeds, and different walking speeds, thus making it impossible to travel long distances in a straight line.

[0006] (3) The walking motor is prone to oil leakage: When walking at high speed (i.e., two motors are connected in series), the oil circuit between the two motors will be under high pressure. The larger the steering angle and the faster the walking speed, the greater the oil pressure in the middle oil circuit, which may even exceed the maximum pressure of the system. Long-term use may damage the internal oil seal of the motor, which will lead to oil leakage of the motor. Summary of the Invention

[0007] The purpose of this invention is to provide a walking hydraulic system and a scissor lift work platform to solve the problems of traditional walking hydraulic systems being unable to pass through uneven roads at low speeds, unable to travel long distances in a straight line at low speeds, and prone to oil leakage from the walking motor.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution: a walking hydraulic system, the system including a hydraulic oil tank, an oil pump, a first motor and a second motor; the system also includes a first electromagnetic directional valve, a second electromagnetic directional valve, a third electromagnetic directional valve, a fourth electromagnetic directional valve, a first balance valve and a second balance valve, and a flow divider and combiner valve.

[0009] The oil pump's suction port is connected to the hydraulic oil tank's outlet port, and the oil pump's outlet port is connected to the first port of the first solenoid directional valve; the second port of the first solenoid directional valve is connected to the hydraulic oil tank's return port, the third port of the first solenoid directional valve is connected to the first balance valve's inlet port, and the fourth port of the first solenoid directional valve is connected to the second balance valve's inlet port; the first balance valve's outlet port is connected to the second solenoid directional valve's inlet port and the first port of the flow divider / combiner valve; the second solenoid directional valve's outlet port is connected to the second port of the flow divider / combiner valve and the second port of the third solenoid directional valve. The second port of the flow divider / combiner valve is connected to the third port of the flow divider / combiner valve, and a flow regulating element is provided in the oil circuit between the second port and the third port of the flow divider / combiner valve; the first port of the third electromagnetic directional valve is connected to the A port of the first motor and the third port of the fourth electromagnetic directional valve, and the third port of the third electromagnetic directional valve is connected to the B port of the second motor, the third port of the flow divider / combiner valve, and the flow regulating element; the second port of the fourth electromagnetic directional valve is connected to the A port of the second motor and the second port of the first electromagnetic directional valve, and the first port of the fourth electromagnetic directional valve is connected to the B port of the first motor and the oil outlet of the second balance valve.

[0010] Furthermore, the first solenoid directional valve is a three-position four-way solenoid directional valve, the second solenoid directional valve is a two-position two-way solenoid directional valve, and the third and fourth solenoid directional valves are two-position three-way solenoid directional valves.

[0011] Furthermore, the first, second, third, and fourth solenoid directional valves are cartridge-type, plate-type, or multi-way valves.

[0012] Furthermore, a check valve is provided in the oil line between the second port of the fourth electromagnetic directional valve and the second port of the first electromagnetic directional valve.

[0013] Furthermore, a one-way throttle valve is provided on the oil line between the second port of the first electromagnetic directional valve and the return port of the hydraulic oil tank.

[0014] Furthermore, the second port of the fourth electromagnetic directional valve is also connected to the return port of the hydraulic oil tank via an overflow valve.

[0015] Furthermore, a return oil filter is provided at the return port of the hydraulic oil tank.

[0016] Furthermore, the hydraulic oil tank is also connected to an air filter.

[0017] Furthermore, the flow regulating component is a damper, a throttling orifice, or a flow valve.

[0018] Based on the same concept, the present invention also provides a scissor lift work platform, the work platform including the walking hydraulic system as described above.

[0019] Beneficial effects

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] This invention replaces the original two-position four-way electromagnetic directional valve with a third and a fourth electromagnetic directional valve, and adds a flow divider and combiner valve to ensure the average distribution of flow between the two motors when traveling at low speed (i.e., two motors in parallel), so that the two motors rotate at the same speed, thus solving the problems of being unable to travel long distances in a straight line and being prone to slipping and lacking power when traveling at low speed.

[0022] This invention connects a flow regulating component in parallel at the flow divider port of the flow divider and combiner valve, which has a certain flow compensation and regulation function, and solves the problem of high pressure buildup in the flow divider and combiner valve caused by uneven flow demand between the two motors when traveling at low speeds and in non-linear directions.

[0023] The flow divider and combiner valve of the present invention has a second electromagnetic directional valve connected in parallel to its flow combiner port. The oil circuit can be switched by the second electromagnetic directional valve without passing through the flow divider and combiner valve. When traveling at high speed, the flow divider and combiner valve is not involved by switching the oil circuit, which ensures product performance and user experience. It solves the problem of high system pressure and high energy consumption caused by oil flowing through the flow divider and combiner valve when traveling at high speed.

[0024] This invention adds an overflow valve between the oil circuits of two motors connected in series to limit the maximum pressure, thereby preventing the internal oil seals of the motors from being subjected to high pressure, reducing the risk of motor oil leakage, and improving system reliability. Attached Figure Description

[0025] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the existing solution 1 in the background art of this invention;

[0027] Figure 2 This is a schematic diagram of the existing solution two in the background art of this invention;

[0028] Figure 3 This is a schematic diagram of the initial state of the walking hydraulic system in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the high-speed forward operation of the walking hydraulic system in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the high-speed reverse working condition of the walking hydraulic system in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the low-speed forward working condition of the walking hydraulic system in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the low-speed reverse working condition of the walking hydraulic system in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 1-First solenoid directional valve, 2-First balancing valve, 3-Second solenoid directional valve, 4-Diverter / combiner valve, 5-Flow regulator, 6-Third solenoid directional valve, 7-Fourth solenoid directional valve, 8-First motor, 9-Second motor, 10-Check valve, 11-Relief valve, 12-Second balancing valve, 13-One-way throttle valve, 14-Hydraulic oil tank, 15-Return oil filter, 16-Air filter, 17-Motor, 18-Gear pump. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The technical solutions of this application will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0036] like Figure 3 As shown, the walking hydraulic system provided in this embodiment of the invention includes a hydraulic oil tank 14, an oil pump, a first motor 8 and a second motor 9, a first electromagnetic directional valve 1, a second electromagnetic directional valve 3, a third electromagnetic directional valve 6, a fourth electromagnetic directional valve 7, a first balance valve 2 and a second balance valve 12, and a flow divider / combiner valve 4.

[0037] The oil pump's suction port is connected to the hydraulic oil tank 14's outlet port; the oil pump's outlet port is connected to the first port ① of the first solenoid directional valve 1; the second port ② of the first solenoid directional valve 1 is connected to the hydraulic oil tank 14's return port; the third port ③ of the first solenoid directional valve 1 is connected to the first balance valve 2's inlet port; the fourth port ④ of the first solenoid directional valve 1 is connected to the second balance valve 12's inlet port; the first balance valve 2's outlet port is connected to the second solenoid directional valve 3's inlet port and the first port ① of the flow divider / combiner valve 4; the second solenoid directional valve 3's outlet port is connected to the second port ② of the flow divider / combiner valve 4 and the second port ② of the third solenoid directional valve 6; the second port ② of the flow divider / combiner valve 4... It is also connected to the third port ③ of the diversion and combination valve 4, and a flow regulating component 5 is provided in the oil circuit between the second port ② and the third port ③ of the diversion and combination valve 4; the first port ① of the third electromagnetic directional valve 6 is connected to the A port of the first motor 8 and the third port ③ of the fourth electromagnetic directional valve 7, and the third port ③ of the third electromagnetic directional valve 6 is connected to the B port of the second motor 9, the third port ③ of the diversion and combination valve 4 and the flow regulating component 5; the second port ② of the fourth electromagnetic directional valve 7 is connected to the A port of the second motor 9 and the second port ② of the first electromagnetic directional valve 1, and the first port ① of the fourth electromagnetic directional valve 7 is connected to the B port of the first motor 8 and the oil outlet of the second balance valve 12.

[0038] In a specific embodiment of the present invention, the first solenoid directional valve 1 is a three-position four-way solenoid directional valve, the second solenoid directional valve 3 is a two-position two-way solenoid directional valve, and the third solenoid directional valve 6 and the fourth solenoid directional valve 7 are two-position three-way solenoid directional valves. The first solenoid directional valve 1, the second solenoid directional valve 3, the third solenoid directional valve 6, and the fourth solenoid directional valve 7 are cartridge-type solenoid directional valves, plate-type solenoid directional valves, or multi-way valves.

[0039] In a specific embodiment of the present invention, a check valve 10 is provided in the oil line between the second port ② of the fourth electromagnetic reversing valve 7 and the second port ② of the first electromagnetic reversing valve 1, and the check valve 10 is used to replenish the extra oil required by the motor.

[0040] In a specific embodiment of the present invention, a one-way throttle valve 13 is provided in the oil line between the second port ② of the first electromagnetic directional valve 1 and the return port of the hydraulic oil tank 14. In this embodiment, the one-way throttle valve 13 includes a one-way valve and a throttle orifice, or a one-way valve and a damper.

[0041] In a specific embodiment of the present invention, the second port ② of the fourth electromagnetic reversing valve 7 is also connected to the return port of the hydraulic oil tank 14 through the overflow valve 11. When the oil exceeds the pressure threshold, part of the oil flows back to the hydraulic oil tank 14 through the overflow valve 11. By adding an overflow valve 11 in the middle of the oil circuit of the two motors in series, the maximum pressure is limited, the oil seal inside the motor is prevented from bearing high pressure, the risk of motor oil leakage is reduced, and the system reliability is improved.

[0042] In a specific embodiment of the present invention, a return oil filter 15 is provided at the return oil port of the hydraulic oil tank 14 to filter out contaminants generated or intruded in the system, thereby preventing contaminants from entering the hydraulic oil tank 14.

[0043] In a specific embodiment of the present invention, the hydraulic oil tank 14 is also connected to the air filter 16. The air filter 16 keeps the oil in the hydraulic oil tank 14 clean, prevents dust particles from entering the hydraulic oil tank 14 from the outside, and extends the working cycle and service life of the hydraulic oil and components.

[0044] In a specific embodiment of the present invention, the flow regulating component 5 is a damper, a throttling orifice, or a flow valve. A damper, a throttling orifice, or a flow valve is connected in parallel to the two flow ports of the flow divider and combiner valve 4, which has a certain flow compensation and regulation function, and solves the problem of high pressure buildup in the flow divider and combiner valve 4 caused by uneven flow demand of the two motors when traveling at low speeds and non-linear distances.

[0045] In a specific embodiment of the present invention, the oil pump is a gear pump 18, which is driven by a motor 17.

[0046] The walking hydraulic system of the present invention has the following walking conditions: high speed forward, high speed backward, low speed forward, and low speed backward.

[0047] like Figure 4As shown, in the high-speed forward operation (first motor 8 and second motor 9 connected in series): motor 17 drives gear pump 18 to rotate, gear pump 18 outputs oil, the first solenoid Y1 of the first solenoid directional valve 1 and the solenoid Y5 of the second solenoid directional valve 3 are energized (the second solenoid Y2 of the first solenoid directional valve 1, the solenoid Y3 of the third solenoid directional valve 6 and the solenoid Y4 of the fourth solenoid directional valve 7 are de-energized), the oil output from gear pump 18 flows sequentially through the first port ① and the third port ③ of the first solenoid directional valve 1, the first balance valve 2, the second solenoid directional valve 3, the second port ② and the third port ③ of the third solenoid directional valve 6, the B port and the A port of the second motor 9, the second port ② and the third port ③ of the fourth solenoid directional valve 7, the A port and the B port of the first motor 8, the second balance valve 12, the fourth port ④ and the second port ② of the first solenoid directional valve 1, the one-way throttle valve 13, the return oil filter 15 and the hydraulic oil tank 14.

[0048] Under high-speed forward operation, the electromagnet Y5 controlling the second solenoid directional valve 3 is energized, and the oil circuit is switched through the second solenoid directional valve 3 so that the oil does not pass through the diverter valve 4, thus avoiding the problem of high system pressure and high oil consumption caused by the oil flowing through the diverter valve 4 when traveling at high speed. Since some oil is kept at the outlet of the check valve 10 when the oil flows from the second motor 9 to the second port ② of the fourth solenoid directional valve 7, the oil does not flow to the check valve 10 when it flows back to the hydraulic oil tank 14 through the second port ② of the first solenoid directional valve 1.

[0049] like Figure 5 As shown, in the high-speed reverse operation (first motor 8 and second motor 9 connected in series): motor 17 drives gear pump 18 to rotate, gear pump 18 outputs oil, the second electromagnet Y2 of the first solenoid directional valve 1 and the electromagnet Y5 of the second solenoid directional valve 3 are energized (the first electromagnet Y1 of the first solenoid directional valve 1, the electromagnet Y3 of the third solenoid directional valve 6 and the electromagnet Y4 of the fourth solenoid directional valve 7 are de-energized), the oil output from gear pump 18 flows sequentially through the first port ① and the second port ② of the first solenoid directional valve 1. The system includes: port 4, second balance valve 12, port B and port A of first motor 8, third port ③ and second port ② of fourth solenoid directional valve 7 (when the oil pressure exceeds the pressure threshold, part of the oil flows back to the hydraulic oil tank 14 through relief valve 11), port A and port B of second motor 9, third port ③ and second port ② of third solenoid directional valve 6, second solenoid directional valve 3, first balance valve 2, third port ③ and second port ② of first solenoid directional valve 1, one-way throttle valve 13, return oil filter 15 and hydraulic oil tank 14.

[0050] In high-speed reverse operation, the electromagnet Y5 controlling the second electromagnetic directional valve 3 is energized, and the oil circuit is switched through the second electromagnetic directional valve 3 so that the oil does not pass through the diversion and combination valve 4, thus avoiding the problem of high system pressure and high oil consumption caused by the oil flowing through the diversion and combination valve 4 when traveling at high speed.

[0051] like Figure 6 As shown, in the low-speed forward operation (first motor 8 and second motor 9 connected in parallel): motor 17 drives gear pump 18 to rotate, gear pump 18 outputs oil, the first electromagnet Y1 of the first solenoid directional valve 1, the electromagnet Y3 of the third solenoid directional valve 6 and the electromagnet Y4 of the fourth solenoid directional valve 7 are energized (the second electromagnet Y2 of the first solenoid directional valve 1 and the electromagnet Y5 of the second solenoid directional valve 3 are de-energized), the oil output from gear pump 18 flows sequentially through the first port ① and the third port ③ of the first solenoid directional valve 1, the first balance valve 2, and the first port ① of the flow divider and combiner valve 4, and then splits into two parallel oil circuits, one of which is a flow divider and combiner. The second port ② of valve 4, the second port ② and the first port ① of the third solenoid directional valve 6, the A port and the B port of the first motor 8, and the second balance valve 12 (because the oil pressure at the first port ① of the fourth solenoid directional valve 7 is relatively high, it does not flow into the first port ① of the fourth solenoid directional valve 7). The other oil circuit is the third port ③ of the diverting and combining valve 4, the B port and the A port of the second motor 9, the second port ② and the first port ① of the fourth solenoid directional valve 7, and the second balance valve 12. After the two oil circuits are combined at the second balance valve 12, they flow sequentially to the fourth port ④ and the second port ② of the first solenoid directional valve 1, the one-way throttle valve 13, the return oil filter 15, and the hydraulic oil tank 14.

[0052] Under low-speed forward operation, the newly added diverter valve 4 divides the oil into two paths, which flow to the first motor 8 and the second motor 9 respectively, and then they converge at the second balance valve 12. This ensures the average distribution of flow between the two motors when traveling at low speed, making the speeds of the two motors consistent. This enables long-distance straight-line travel at low speed, allowing the motors to pass through roads with potholes or slopes at low speed. It solves the problems of being unable to travel long distances in a straight line and being prone to slipping and losing power when traveling at low speed.

[0053] like Figure 7As shown, in the low-speed reverse operation (first motor 8 and second motor 9 connected in parallel): motor 17 drives gear pump 18 to rotate, gear pump 18 outputs oil, the second electromagnet Y2 of the first solenoid directional valve 1, the electromagnet Y3 of the third solenoid directional valve 6, and the electromagnet Y4 of the fourth solenoid directional valve 7 are energized (the first electromagnet Y1 of the first solenoid directional valve 1 and the electromagnet Y5 of the second solenoid directional valve 3 are de-energized). The oil output from gear pump 18 flows sequentially through the first port ① and the fourth port ④ of the first solenoid directional valve 1, and the second balance valve 12, and then splits into two oil circuits, in which... One oil circuit consists of ports B and A of the first motor 8, port 1 and port 2 of the third solenoid directional valve 6, port 2 and port 1 of the flow divider / combiner valve 4, and the first balance valve 2. The other oil circuit consists of ports 1 and 2 of the fourth solenoid directional valve 7, ports A and B of the second motor 9, port 3 and port 1 of the flow divider / combiner valve 4, and the first balance valve 2. After the two oil circuits are combined at the first balance valve 2, the oil flows sequentially to port 3 and port 2 of the first solenoid directional valve 1, one-way throttle valve 13, return oil filter 15, and hydraulic oil tank 14.

[0054] In low-speed reverse operation, the newly added diverter valve 4 divides the oil into two paths, which flow to the first motor 8 and the second motor 9 respectively, and then they converge at the first balance valve 2. This ensures that the flow of the two motors is evenly distributed when traveling at low speed, so that the two motors rotate at the same speed. This enables long-distance straight travel at low speed and allows the motor to pass through roads with potholes or slopes at low speed. It solves the problems of being unable to travel long distances in a straight line and being prone to slipping and losing power when traveling at low speed.

[0055] This invention also provides a scissor lift work platform, the work platform including the walking hydraulic system described above.

[0056] The above description only discloses specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A walking hydraulic system, the system comprising a hydraulic oil tank, an oil pump, a first motor, and a second motor; characterized in that: The system also includes a first electromagnetic directional valve, a second electromagnetic directional valve, a third electromagnetic directional valve, a fourth electromagnetic directional valve, a first balancing valve, a second balancing valve, and a flow divider / combiner valve. The oil pump's suction port is connected to the hydraulic oil tank's outlet port, and the oil pump's outlet port is connected to the first port of the first solenoid directional valve; the second port of the first solenoid directional valve is connected to the hydraulic oil tank's return port, the third port of the first solenoid directional valve is connected to the first balance valve's inlet port, and the fourth port of the first solenoid directional valve is connected to the second balance valve's inlet port; the first balance valve's outlet port is connected to the second solenoid directional valve's inlet port and the first port of the flow divider / combiner valve; the second solenoid directional valve's outlet port is connected to the second port of the flow divider / combiner valve and the second port of the third solenoid directional valve. The second port of the flow divider / combiner valve is connected to the third port of the flow divider / combiner valve, and a flow regulating component is provided in the oil circuit between the second port and the third port of the flow divider / combiner valve; the first port of the third electromagnetic directional valve is connected to the A port of the first motor and the third port of the fourth electromagnetic directional valve, and the third port of the third electromagnetic directional valve is connected to the B port of the second motor, the third port of the flow divider / combiner valve, and the flow regulating component; the second port of the fourth electromagnetic directional valve is connected to the A port of the second motor and the second port of the first electromagnetic directional valve, and the first port of the fourth electromagnetic directional valve is connected to the B port of the first motor and the oil outlet of the second balance valve; The first solenoid directional valve is a three-position four-way solenoid directional valve, the second solenoid directional valve is a two-position two-way solenoid directional valve, and the third and fourth solenoid directional valves are two-position three-way solenoid directional valves.

2. The walking hydraulic system according to claim 1, characterized in that: The first, second, third, and fourth solenoid directional valves are cartridge-type, plate-type, or multi-way valves.

3. The walking hydraulic system according to claim 1, characterized in that: A check valve is provided in the oil line between the second port of the fourth electromagnetic directional valve and the second port of the first electromagnetic directional valve.

4. The walking hydraulic system according to claim 1, characterized in that: A one-way throttle valve is provided in the oil line between the second port of the first electromagnetic reversing valve and the return port of the hydraulic oil tank.

5. The walking hydraulic system according to claim 1, characterized in that: The second port of the fourth electromagnetic directional valve is also connected to the return port of the hydraulic oil tank via an overflow valve.

6. The walking hydraulic system according to claim 1, characterized in that: A return oil filter is installed at the return port of the hydraulic oil tank.

7. The walking hydraulic system according to claim 1, characterized in that: The hydraulic oil tank is also connected to an air filter.

8. The walking hydraulic system according to claim 1, characterized in that: The flow regulating component is a damper, a throttling orifice, or a flow valve.

9. A scissor lift work platform, characterized in that: The working platform includes the walking hydraulic system as described in any one of claims 1 to 8.

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