Lifting protection system and method for lifting platform

Abstract

The invention discloses a lifting protection system and method for a lifting platform, and the system comprises a driving mechanism, a hydraulic pump, an oil tank, a hydraulic oil cylinder, a direction control valve, an overflow valve and a control host. The driving mechanism is used for driving the hydraulic pump; the hydraulic pump is used for transporting hydraulic oil between the oil tank and the hydraulic oil cylinder; the oil tank is used for storing hydraulic oil; the hydraulic oil cylinder is used for conveying and receiving hydraulic oil and controlling lifting of the lifting platform. The direction control valve is used for controlling the flowing direction of hydraulic oil between the oil tank and the hydraulic oil cylinder; the overflow valve is opened when the pressure in the hydraulic oil cylinder reaches the preset pressure, so that hydraulic oil in the hydraulic oil cylinder flows into the oil tank; the control host is used for controlling the driving mechanism, the direction control valve and the overflow valve. According to the embodiment of the invention, the pressure in the hydraulic oil cylinder is controlled through the overflow valve, so that the lifting height of the lifting platform is controlled, and the problem that the lifting platform cannot be stopped due to faults in the lifting process is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic lifting platforms, and in particular to a lifting platform rising protection system and method. Background Art

[0002] In the prior art, the hydraulic lifting platform is a common industrial equipment used to provide a height-adjustable working platform. However, there are some potential safety risks in the operation of the hydraulic lifting platform. When workers are working at height on the lifting platform, if the lifting platform fails during the ascent and cannot stop, it will cause serious threat to the lives of the workers and damage to the lifting platform. Summary of the invention

[0003] The embodiments of the present invention provide a lifting platform ascent protection system and method, aiming to solve the problem that the existing lifting platform cannot stop due to failure during the ascent process.

[0004] To solve the above technical problems, in the first aspect, an embodiment of the present invention provides a lifting platform rising protection system, including: a driving mechanism, a hydraulic pump, an oil tank, a hydraulic cylinder, a directional control valve, a relief valve and a control host; the driving mechanism is used to drive the hydraulic pump; the hydraulic pump is used to transport hydraulic oil between the oil tank and the hydraulic cylinder; the oil tank is used to store hydraulic oil; the hydraulic cylinder is used to transport and receive hydraulic oil and control the lifting of the lifting platform; the directional control valve is used to control the flow direction of the hydraulic oil between the oil tank and the hydraulic cylinder; the relief valve is used to open when the pressure in the hydraulic cylinder reaches a preset pressure, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank; the control host is used to control the start and close of the driving mechanism, to control the opening direction of the directional control valve and to control the relief valve to set the preset pressure of the pressure in the hydraulic cylinder, and when the pressure in the hydraulic cylinder is greater than the preset pressure, the control host is used to control the relief valve to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank.

[0005] Furthermore, the lifting platform rising protection system also includes: a pressure gauge, which is used to display the pressure information of the hydraulic cylinder and feed back the pressure information to the control host, and the control host is used to control the overflow valve to open when the pressure information reaches a preset pressure, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank.

[0006] Furthermore, the lifting platform rising protection system also includes: a displacement sensor, which is used to detect the position information of the lifting platform rising and feed the position information back to the control host, and the control host is used to compare the position information with the preset position, and control the overflow valve to open when the position information reaches the preset position, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank; wherein the preset position is a safety position pre-set on the lifting platform.

[0007] Furthermore, the lifting platform ascent protection system also includes: a stroke limiter, and the stroke limiter is used to limit the ascent position of the lifting platform.

[0008] Furthermore, the lifting platform rise protection system also includes: an alarm device, which is used to issue an alarm when the pressure in the hydraulic cylinder reaches a preset pressure.

[0009] In a second aspect, an embodiment of the present invention further provides a lifting platform rise protection method including the lifting platform rise protection system as described above, comprising:

[0010] The control host controls the direction control valve to connect the oil tank with the hydraulic cylinder and adjust the flow direction of the hydraulic oil to flow from the oil tank to the hydraulic cylinder;

[0011] The control host controls the driving mechanism to start, and the driving mechanism drives the hydraulic pump to flow the hydraulic oil in the oil tank into the hydraulic cylinder;

[0012] When the pressure in the hydraulic cylinder reaches a preset pressure, the control host controls the overflow valve connected to the hydraulic cylinder to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank.

[0013] Furthermore, the lifting platform rising protection method also includes:

[0014] Displaying the pressure information of the hydraulic cylinder through a pressure gauge and feeding back the pressure information to the control host;

[0015] The control host determines whether the pressure information reaches the preset pressure;

[0016] If yes, the control host controls the overflow valve to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank;

[0017] If not, the control host controls the relief valve to remain closed.

[0018] Furthermore, the lifting platform rising protection method also includes:

[0019] Detecting the rising position information of the lifting platform through a displacement sensor and feeding the position information back to the control host;

[0020] The control host determines whether the position information reaches a preset position;

[0021] If yes, the control host controls the overflow valve to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank;

[0022] If not, the control host controls the relief valve to remain closed.

[0023] Furthermore, the lifting platform rising protection method also includes:

[0024] When the lifting platform rises to a preset position, the rise of the lifting platform is limited by a stroke limiter.

[0025] Furthermore, the lifting platform rising protection method also includes:

[0026] When the pressure in the hydraulic cylinder reaches a preset pressure or the lifting platform rises to a preset position, an alarm is sounded through the alarm device.

[0027] An embodiment of the present invention provides a lifting platform ascent protection system and method, wherein the system includes: a driving mechanism, a hydraulic pump, an oil tank, a hydraulic cylinder, a directional control valve, a relief valve and a control host; the driving mechanism is used to drive the hydraulic pump; the hydraulic pump is used to transport the hydraulic oil between the oil tank and the hydraulic cylinder; the oil tank is used to store the hydraulic oil; the hydraulic cylinder is used to deliver and receive the hydraulic oil and control the lifting of the lifting platform; the directional control valve is used to control the flow direction of the hydraulic oil between the oil tank and the hydraulic cylinder; the relief valve is used to open when the pressure in the hydraulic cylinder reaches a preset pressure, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank; the control host is used to control the start and close of the driving mechanism, to control the opening direction of the directional control valve and to control the relief valve to set the preset pressure of the pressure in the hydraulic cylinder, and when the pressure in the hydraulic cylinder is greater than the preset pressure, the control host is used to control the overflow valve to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank. In the embodiment of the present invention, the pressure in the hydraulic cylinder corresponds to the height of the lifting platform. The greater the pressure, the higher the height of the lifting platform. The pressure in the hydraulic cylinder is controlled by the overflow valve, and then the rising height of the lifting platform is controlled, which effectively solves the problem that the lifting platform cannot be stopped due to a malfunction during the rising process, and prevents serious life threats to the staff and damage to the lifting platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the structure of a lifting platform ascent protection system provided by an embodiment of the present invention;

[0030] Figure 2 A schematic block diagram of a lifting platform rise protection system provided by an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of a flow chart of a lifting platform ascent protection method provided by an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of a sub-process of a lifting platform ascent protection method provided by an embodiment of the present invention;

[0033] Figure 5 A schematic diagram of another sub-process of the lifting platform ascent protection method provided in an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 100. Lifting platform; 101. Driving mechanism; 102. Hydraulic pump; 103. Oil tank; 104. Hydraulic cylinder; 105. Overflow valve; 106. Control host; 107. Pressure gauge; 108. Displacement sensor; 109. Directional control valve; 110. Stroke limiter; 111. Alarm device. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] Because of the technical problem in the prior art that the lifting platform cannot stop when a fault occurs during the rising process.

[0038] See also Figure 1-2In order to solve the above technical problems, the present invention proposes a lifting platform rising protection system, including: a driving mechanism 101, a hydraulic pump 102, an oil tank 103, a hydraulic cylinder 104, a directional control valve 109, a relief valve 105 and a control host 106; the driving mechanism 101 is used to drive the hydraulic pump 102; the hydraulic pump 102 is used to transport the hydraulic oil between the oil tank 103 and the hydraulic cylinder 104; the oil tank 103 stores the hydraulic oil; the hydraulic cylinder 104 is used to transport and receive the hydraulic oil and control the lifting of the lifting platform 100; the directional control valve 109 is used to control the hydraulic oil between the oil tank 103 and The flow direction between the hydraulic cylinders 104; the overflow valve 105 is used to allow the hydraulic oil in the hydraulic cylinder 104 to flow into the oil tank 103 when the pressure in the hydraulic cylinder 104 reaches a preset pressure; the control host 106 is used to control the start and stop of the drive mechanism 101, to control the opening direction of the directional control valve 109 and to control the overflow valve 105 to set the preset pressure of the pressure in the hydraulic cylinder 104, and when the pressure in the hydraulic cylinder 104 is greater than the preset pressure, the control host 106 is used to control the overflow valve 105 to open, so that the hydraulic oil in the hydraulic cylinder 104 flows into the oil tank 103.

[0039] In the embodiment of the present invention, the driving mechanism 101 is connected to and drives the hydraulic pump 102, and the hydraulic pump 102 is respectively connected to the oil tank 103, the hydraulic cylinder 104 and the overflow valve 105. A directional control valve 109 is arranged between the hydraulic pump 102 and the hydraulic cylinder 104. When the driving mechanism 101 is started, the hydraulic pump 102 starts to work, pressurizes the hydraulic oil from the oil tank 103 and flows it into the hydraulic cylinder 104. The hydraulic cylinder 104 is subjected to the thrust of the hydraulic oil, thereby pushing the lifting platform 100 to rise; a movable valve core is arranged in the directional control valve 109, and the position of the valve core determines the opening and closing of the internal channel of the directional control valve 109. A plurality of channels are arranged inside the valve, and these channels can be connected to different hydraulic circuits in the hydraulic system. When the valve core moves to different positions, different channels will be opened or closed, thereby changing the low-pressure ends at both ends of the hydraulic pump 102, that is, changing the direction in which the hydraulic pump 102 sucks in the hydraulic oil, thereby controlling the flow direction of the hydraulic oil. For example, when the valve core is in the first position, the pressure at the directional control valve end is higher than the pressure at the oil tank end, the hydraulic pump 102 sucks hydraulic oil from the oil tank 103, and the hydraulic oil flows from the oil tank 103 to the hydraulic cylinder 104 after being pressurized by the hydraulic pump 102. When the valve core moves to the second position, the pressure at the directional control valve end is lower than the pressure at the oil tank end, the hydraulic pump 102 sucks hydraulic oil from the directional control valve end, that is, sucks hydraulic oil from the hydraulic cylinder 104, and the hydraulic oil flows from the hydraulic cylinder 104 to the oil tank 103 after being pressurized by the hydraulic pump 102. The flow direction and pressure of the hydraulic oil can be adjusted by the directional control valve 109, thereby controlling the movement speed and stop position of the lifting platform 100; when it is necessary to descend, the directional control valve 109 changes the flow direction of the hydraulic oil, so that the hydraulic oil in the hydraulic cylinder 104 returns to the oil tank 103, thereby controlling the descent of the lifting platform 100. The pressure in the hydraulic cylinder 104 corresponds to the height of the lifting platform 100. The greater the pressure in the hydraulic cylinder 104, the higher the height of the lifting platform 100. The preset pressure of the pressure in the hydraulic cylinder 104 is set according to the safe height to which the lifting platform 100 can rise. The overflow valve 105 is controlled to set the preset pressure of the hydraulic cylinder 104, that is, to set the pressure threshold for the opening of the overflow valve 105. When the pressure from one end of the hydraulic cylinder 104 to the preset pressure is received by the overflow valve 105, the overflow valve 105 opens. The pressure in the hydraulic cylinder 104 is controlled by the overflow valve 105, and then the rising height of the lifting platform 100 is controlled, which effectively solves the problem that the lifting platform 100 cannot be stopped due to a fault during the rising process, and prevents serious life threats to the staff and damage to the lifting platform 100. The control host 106 is used to control the overflow valve 105 to open when the pressure in the hydraulic cylinder 104 is greater than the preset pressure, which can prevent the overflow valve 105 from causing damage to the staff and equipment when it fails to open automatically.

[0040] Specifically, the preset pressure in the hydraulic cylinder 104 is set according to the safe position during the rising process of the lifting platform 100. The pressure in the hydraulic cylinder 104 does not exceed the preset pressure, that is, the rising height of the lifting platform 100 does not exceed the height of the safe position to ensure the safety of the staff.

[0041] In some embodiments, the lifting platform rising protection system also includes: a pressure gauge 107, which is used to display the pressure information of the hydraulic cylinder 104 and feed the pressure information back to the control host 106. The control host 106 is used to control the overflow valve 105 to open when the pressure information reaches a preset pressure, so that the hydraulic oil in the hydraulic cylinder 104 flows into the oil tank 103.

[0042] In this embodiment, the pressure gauge 107 can intuitively display the pressure information of the hydraulic cylinder 104, and feed back the pressure information to the control host 106 for comparison with the preset pressure. When the pressure in the hydraulic cylinder 104 reaches the preset pressure, that is, when the lifting platform is at an unsafe height, the overflow valve 105 opens to allow the hydraulic oil in the hydraulic cylinder 104 to flow into the oil tank 103 to reduce the pressure in the hydraulic cylinder 104, thereby reducing the height of the lifting platform 100. The pressure gauge 107 can monitor the hydraulic cylinder 104 in real time to protect the safety of staff and equipment.

[0043] In some embodiments, the lifting platform rising protection system also includes: a displacement sensor 108, which is used to detect the rising position information of the lifting platform 100 and feed the position information back to the control host 106, and the control host 106 is used to compare the position information with the preset position, and control the overflow valve 105 to open when the position information reaches the preset position, so that the hydraulic oil in the hydraulic cylinder 104 flows into the oil tank 103; wherein the preset position is a pre-set safety position on the lifting platform 100.

[0044] In this embodiment, the preset position is a pre-set safety position on the lifting platform 100, and the preset position corresponds to a preset pressure in the hydraulic cylinder 104. When the lifting platform 100 reaches the preset position, the pressure in the hydraulic cylinder 104 reaches the preset pressure at the same time, and the displacement sensor 108 monitors the position of the lifting platform 100 in real time. When the lifting platform 100 reaches the preset position, the overflow valve 105 opens, allowing the hydraulic oil in the hydraulic cylinder 104 to flow into the oil tank 103, thereby lowering the height of the lifting platform 100 and further ensuring the safety of the staff and lifting equipment.

[0045] In some embodiments, the lifting platform ascent protection system further includes: a stroke limiter 110 , and the stroke limiter 110 is used to limit the ascent position of the lifting platform 100 .

[0046] In this embodiment, the stroke limiter 110 is arranged in a safe position where the lifting platform 100 can rise, to prevent the control host 106 and the relief valve 105 from malfunctioning, making it impossible to issue instructions to the equipment and reduce the pressure in the hydraulic cylinder 104. The lifting platform 100 can only be blocked by the stroke limiter 110. An audible and visual alarm mechanism is provided on the stroke limiter 110. When the stroke limiter 110 is hit by the lifting platform 100, the audible and visual alarm mechanism sends out an alarm to alert the staff, thereby protecting the safety of the staff and the equipment.

[0047] In some embodiments, the lifting platform rise protection system further includes: an alarm device 111, and the alarm device 111 is used to issue an alarm when the pressure of the hydraulic cylinder 104 reaches a preset pressure or when the lifting platform 100 rises to a preset position.

[0048] In this embodiment, when the pressure of the hydraulic cylinder 104 reaches a preset pressure or when the lifting platform 100 rises to a preset position, that is, when the lifting platform 100 is in a dangerous rising stage, the alarm device 111 can sound an alarm, so that the staff on the lifting platform 100 or the ground staff can take protective measures in time to prevent damage to the staff. Specifically, the lifting platform rising protection system also includes: an emergency stop device (not shown), which is used to perform an emergency stop operation on the lifting platform 100 when the pressure of the hydraulic cylinder 104 reaches a preset pressure or when the lifting platform 100 rises to a preset position. The emergency stop device can immediately stop the operation of the lifting platform 100 to respond to emergency situations or dangerous events, further ensuring the safety of staff and equipment.

[0049] See also Figure 3 The embodiment of the present invention further provides a lifting platform rising protection method including a lifting platform rising protection system, including steps S201 to S203:

[0050] S201, the control host 106 controls the direction control valve 109 to connect the oil tank 103 with the hydraulic cylinder 104, and adjusts the flow direction of the hydraulic oil from the oil tank 103 to the hydraulic cylinder 104;

[0051] In this step, the directional control valve 109 is used to control the flow direction of the hydraulic oil between the oil tank 103 and the hydraulic cylinder 104. When controlling the lifting platform 100 to rise, the directional control valve 109 adjusts the direction of the hydraulic oil to flow from the oil tank 103 to the hydraulic cylinder 104.

[0052] S202, the control host 106 controls the driving mechanism 101 to start, and the driving mechanism 101 drives the hydraulic pump 102 to flow the hydraulic oil in the oil tank 103 into the hydraulic cylinder 104;

[0053] S203 , when the pressure in the hydraulic cylinder 104 reaches a preset pressure, the control host 106 controls the overflow valve 105 connected to the hydraulic cylinder 104 to open, so that the hydraulic oil in the hydraulic cylinder 104 flows into the oil tank 103 .

[0054] In this step, the preset pressure of the pressure in the hydraulic cylinder 104 is set according to the safe height to which the lifting platform 100 can rise. The overflow valve 105 is controlled to set the preset pressure of the hydraulic cylinder 104, that is, to set the pressure threshold for opening the overflow valve 105. When the pressure from one end of the hydraulic cylinder 104 to which the overflow valve 105 is subjected reaches the preset pressure, the overflow valve 105 opens. The control host 106 is used to control the overflow valve 105 to open when the pressure in the hydraulic cylinder 104 is greater than the preset pressure, thereby preventing the overflow valve 105 from causing damage to the staff and equipment when it fails to open automatically.

[0055] In the embodiment of the present invention, the pressure in the hydraulic cylinder 104 is controlled by the overflow valve 105, thereby controlling the rising height of the lifting platform 100, thereby effectively solving the problem that the lifting platform 100 cannot be stopped due to a malfunction during the rising process, thereby preventing serious life threats to the staff and damage to the lifting platform 100.

[0056] See also Figure 4 In some embodiments, the lifting platform rising protection method further includes steps S301 to S303:

[0057] S301, displaying the pressure information of the hydraulic cylinder 104 through the pressure gauge 107, and feeding back the pressure information to the control host 106;

[0058] S302, the control host 106 determines whether the pressure information reaches a preset pressure;

[0059] S303, if yes, the control host 106 controls the overflow valve 105 to open and allow the hydraulic oil in the hydraulic cylinder 104 to flow into the oil tank 103; if no, the control host 106 controls the overflow valve 105 to remain closed.

[0060] In the embodiment of the present invention, the pressure gauge 107 can monitor the pressure in the hydraulic cylinder 104 in real time. When the pressure in the hydraulic cylinder 104 is higher than the preset pressure, if the overflow valve 105 does not open automatically, the control host 106 controls the overflow valve 105 to open and allow the hydraulic oil in the hydraulic cylinder 104 to flow into the oil tank 103, so as to reduce the pressure in the hydraulic cylinder 104, and then reduce the height of the lifting platform 100 to protect the safety of the staff and equipment.

[0061] See also Figure 5 In some embodiments, the lifting platform rising protection method further includes steps S401 to S403:

[0062] S401, the displacement sensor 108 detects the rising position information of the lifting platform 100 and feeds the position information back to the control host 106;

[0063] S402, the control host 106 determines whether the position information reaches a preset position;

[0064] S403, if yes, the control host 106 controls the overflow valve 105 to open and flow the hydraulic oil in the hydraulic cylinder 104 into the oil tank 103; if no, the control host 106 controls the overflow valve 105 to remain closed.

[0065] In the embodiment of the present invention, the displacement sensor 108 monitors the position of the lifting platform 100 in real time. When the lifting platform 100 reaches the preset position, the overflow valve 105 opens, allowing the hydraulic oil in the hydraulic cylinder 104 to flow into the oil tank 103, and the hydraulic cylinder 104 is depressurized, thereby lowering the height of the lifting platform 100, further ensuring the safety of the staff and the lifting equipment.

[0066] In some embodiments, the lifting platform ascent protection method further includes, when the lifting platform 100 rises to a preset position, the stroke limiter 110 limits the ascent of the lifting platform 100. In this embodiment, when a fault occurs during the ascent of the lifting platform 100, the stroke limiter 110 set at a safe height will block the lifting platform 100 to prevent the lifting platform 100 from continuing to rise, thereby protecting the safety of the staff and equipment.

[0067] In some embodiments, the lifting platform ascent protection method further includes the alarm device 111 sounding an alarm when the pressure in the hydraulic cylinder 104 reaches a preset pressure or when the lifting platform 100 rises to a preset position. In this embodiment, the alarm device 111 can sound an alarm so that the staff on the lifting platform 100 or the ground staff can take protective measures in time, thereby preventing injuries to the staff.

[0068] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting platform rise protection system, characterized in that: include: Driving mechanism, hydraulic pump, oil tank, hydraulic cylinder, directional control valve, relief valve and control host; The driving mechanism is used to drive the hydraulic pump; The hydraulic pump is used to transport hydraulic oil between the oil tank and the hydraulic cylinder; The oil tank is used to store hydraulic oil; The hydraulic cylinder is used to transport and receive hydraulic oil and control the lifting and lowering of the lifting platform; The directional control valve is used to control the flow direction of the hydraulic oil between the oil tank and the hydraulic cylinder; The overflow valve is used to open when the pressure in the hydraulic cylinder reaches a preset pressure, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank; The control host is used to control the start and stop of the driving mechanism, to control the opening direction of the directional control valve, and to control the overflow valve to set a preset pressure of the pressure in the hydraulic cylinder. When the pressure in the hydraulic cylinder is greater than the preset pressure, the control host is used to control the overflow valve to open so that the hydraulic oil in the hydraulic cylinder can flow into the oil tank.

2. The lifting platform rise protection system according to claim 1, characterized in that: The lifting platform rising protection system also includes: A pressure gauge is used to display the pressure information of the hydraulic cylinder and feed the pressure information back to the control host. The control host is used to control the overflow valve to open when the pressure information reaches a preset pressure, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank.

3. The lifting platform rise protection system according to claim 1, characterized in that: The lifting platform rising protection system also includes: A displacement sensor is used to detect the position information of the lifting platform as it rises and feed the position information back to the control host, the control host is used to compare the position information with a preset position, and control the overflow valve to open when the position information reaches the preset position, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank; wherein the preset position is a safety position pre-set on the lifting platform.

4. The lifting platform rise protection system according to claim 1, characterized in that: The lifting platform rising protection system also includes: A stroke limiter is used to limit the rising position of the lifting platform.

5. The lifting platform rise protection system according to claim 1, characterized in that: The lifting platform rising protection system also includes: An alarm device is used to sound an alarm when the pressure in the hydraulic cylinder reaches a preset pressure or when the lifting platform rises to a preset position.

6. A lifting platform rising protection method, characterized in that: include: The control host controls the direction control valve to connect the oil tank with the hydraulic cylinder and adjust the flow direction of the hydraulic oil to flow from the oil tank to the hydraulic cylinder; The control host controls the driving mechanism to start, and the driving mechanism drives the hydraulic pump to flow the hydraulic oil in the oil tank into the hydraulic cylinder; When the pressure in the hydraulic cylinder reaches a preset pressure, the control host controls the overflow valve connected to the hydraulic cylinder to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank.

7. The lifting platform rising protection method according to claim 6, characterized in that: The lifting platform rising protection method also includes: Displaying the pressure information of the hydraulic cylinder through a pressure gauge and feeding back the pressure information to the control host; The control host determines whether the pressure information reaches the preset pressure; If yes, the control host controls the overflow valve to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank; If not, the control host controls the relief valve to remain closed.

8. The lifting platform rising protection method according to claim 6, characterized in that: The lifting platform rising protection method also includes: Detecting the rising position information of the lifting platform through a displacement sensor and feeding the position information back to the control host; The control host determines whether the position information reaches a preset position; If yes, the control host controls the overflow valve to open, so that the hydraulic oil in the hydraulic cylinder flows into the oil tank; If not, the control host controls the relief valve to remain closed.

9. The lifting platform rising protection method according to claim 6, characterized in that: The lifting platform rising protection method also includes: When the lifting platform rises to a preset position, the rise of the lifting platform is limited by a stroke limiter.

10. The lifting platform rising protection method according to claim 6, characterized in that: The lifting platform rising protection method also includes: When the pressure in the hydraulic cylinder reaches a preset pressure or the lifting platform rises to a preset position, an alarm is sounded through the alarm device.

Images