Energy-saving control system for lifting platform

Abstract

The utility model relates to an energy-saving control system for a lifting platform. The energy-saving control system comprises a pair of portal frames, two first hydraulic cylinder units, the lifting platform, at least one pair of second hydraulic cylinder units and a bearing platform. And the second hydraulic cylinder unit is vertically fixed on the lifting platform. The bearing platform is fixed to the upper end of a cylinder rod of the second hydraulic cylinder unit. A cylinder cavity pipeline of the first hydraulic cylinder unit is arranged on the first two-position four-way electromagnetic valve in a matched mode. And a first branch is arranged on the lower cylinder cavity pipeline of the first hydraulic cylinder unit and between the connecting port and the first two-position four-way electromagnetic valve. And a two-position two-way electromagnetic valve I and a one-way valve are arranged on the first branch. A cylinder cavity pipeline of the second hydraulic cylinder unit is arranged on the second two-position four-way electromagnetic valve in a matched mode. And a second branch is arranged on the lower cylinder cavity connecting pipeline of the second hydraulic cylinder unit and between the connecting port and the two-position four-way electromagnetic valve II. And a two-position two-way electromagnetic valve II, a one-way valve and a pressure cylinder are sequentially arranged on the second branch. According to the utility model, the energy-saving purpose can be realized.

Description

Technical Field

[0001] The utility model relates to a lifting platform equipment, in particular to an energy-saving control system for a lifting platform. Background Art

[0002] Lifting platforms are widely used in cargo loading, unloading and transferring operations in sites such as warehouses, docks, and logistics workshops. An existing cargo unloading and lifting platform mostly used in ports and docks includes a vehicle frame, a pair of gantry frames arranged oppositely left and right on the vehicle frame, a pair of hydraulic cylinder units respectively corresponding to and matched with each gantry frame, a chain assembly arranged on the gantry frame, and a lifting platform. The gantry frame includes a fixed part and a U-shaped movable arm, with the open end of the movable arm facing downwards, and the movable part and the fixed arm are matched through a slide rail structure arranged in the vertical direction. The lower end of the hydraulic cylinder body of the hydraulic cylinder unit is fixed on the upper part of the vehicle frame, and the upper end is matched with the movable arm, so that the movable arm can move up and down with the telescopic movement of the hydraulic cylinder rod. The sprocket part of the chain assembly is fixed on the upper part of the movable arm and includes at least a pair of sprockets, and both ends of the chain matched on the same sprocket hang down, with one end fixed on the fixed arm and the other end fixedly connected to the movable arm. The provided chain assembly can pull the movable arm to move smoothly during the process of the hydraulic cylinder unit driving the movable arm to move up and down relative to the fixed arm, which helps to optimize the force application mode of the hydraulic cylinder on the movable arm and increase the load-bearing capacity. The left and right sides of the lifting platform are respectively provided with shaped holes corresponding to the gantry frames, and the lower part of the movable arm is fixedly connected to the lifting platform. In this way, with the up and down movement of the two movable arms, the lifting platform can be synchronously lifted and lowered, and the goods to be unloaded from a high place are placed on the lifting platform. The pump station unit is generally fixed on the vehicle frame. Regarding the above structure, it is involved in the Figure 1 、 Figure 2 shown solutions and can be used as a reference. Since it belongs to the category of the prior art, no detailed introduction will be made. Therefore, the lifting platform with the aforementioned features has the following situations during use: when the lifting platform moves upward, there is no cargo on its upper part, which is in a no-load upward running state; when the lifting platform moves downward, its upper part is mostly in a state of carrying heavy goods. To ensure a smooth descent, the hydraulic cylinder needs to contract gently in the pressure-holding state during movement, which consumes a certain amount of hydraulic energy. Summary of the Utility Model

[0003] To achieve the purpose of energy conservation, the utility model provides an energy-saving control system for a lifting platform, which can convert and utilize the heavy energy of goods, helps to reduce the energy consumption when the goods move downward, and can achieve the purpose of energy conservation.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows: An energy-saving control system for a lifting platform, which includes a pair of gantry frames installed on a vehicle frame, two first hydraulic cylinder units respectively corresponding to and matching the two gantry frames, a lifting platform matching the two gantry frames, at least a pair of second hydraulic cylinder units fixed on the lifting platform, and a supporting platform.

[0005] The two gantry frames are installed on the vehicle frame relatively left and right. The gantry frame includes a pair of fixed arms and a U-shaped movable arm. The lower end of the fixed arm is fixedly connected to the vehicle frame, and the closed end of the movable arm faces upward. The movable arm is placed between two relatively front and rear fixed arms, and the two are matched through a slide rail structure arranged in the vertical direction.

[0006] The hydraulic cylinder body of the first hydraulic cylinder unit is correspondingly arranged between two relatively front and rear fixed arms, and the lower part of the hydraulic cylinder body is fixed on the vehicle frame. The upper end of the cylinder rod is matched with the cross plate of the movable arm, and can drive the movable arm to lift and move along with the telescopic action of the first hydraulic cylinder unit.

[0007] On the left and right sides of the lifting platform, there are respectively formed groove holes or groove notches corresponding to and matching the two fixed arms. After the fixed arm passes through the groove hole or the groove notch, it extends vertically upward. The lifting platform is respectively matched with the two movable arms through a chain assembly, so that when the movable arm makes a lifting movement, the lifting platform can be pulled by the chain to make a lifting movement.

[0008] The hydraulic cylinder body of the second hydraulic cylinder unit is vertically fixed on the lifting platform, and its cylinder rod extends upward relative to the upper end surface of the lifting platform. The hydraulic cylinder body of the second hydraulic cylinder unit extends downward relative to the lower end surface of the lifting platform. The supporting platform is fixed on the upper end of the cylinder rod of the second hydraulic cylinder unit and can move upward and downward relative to the lifting platform along with the telescopic action of the cylinder rod of the second hydraulic cylinder unit.

[0009] During use, first, the supporting platform is driven by the second hydraulic cylinder unit to move upward relative to the lifting platform to a suitable position, and then the goods to be unloaded are placed on the upper end surface of the supporting platform.

[0010] The connecting pipelines of the lower cylinder cavity and the upper cylinder cavity of the first hydraulic cylinder unit are matched on a two-position four-way solenoid valve 1, and the flow direction of the hydraulic oil in the two connecting pipelines can be regulated by switching the passage position of the two-position four-way solenoid valve 1;

[0011] On the connecting pipeline of the lower cylinder cavity of the first hydraulic cylinder unit, a first branch is provided between the connecting port of the lower cylinder cavity and the two-position four-way solenoid valve 1. A two-position two-way solenoid valve 1 and a one-way valve are provided on the first branch, and the one-way valve enables the hydraulic oil to only flow from the first branch to the lower cylinder cavity of the first hydraulic cylinder unit.

[0012] By switching the passage position of the two-position two-way solenoid valve 1, the on / off state of the first branch can be controlled.

[0013] The connecting pipelines of the lower cylinder chamber and the upper cylinder chamber of the second hydraulic cylinder unit are matched on the two-position four-way solenoid valve 2, and the flow direction of the hydraulic oil in the two connecting pipelines can be regulated by switching the passage position of the two-position four-way solenoid valve 2;

[0014] On the connecting pipeline of the lower cylinder chamber of the second hydraulic cylinder unit, a second branch is provided between the connecting port of the lower cylinder chamber and the two-position four-way solenoid valve 2; on the second branch, a two-position two-way solenoid valve 2, a check valve and a booster cylinder are successively provided, and the check valve enables the hydraulic oil to only flow towards the booster cylinder.

[0015] By switching the passage position of the two-position two-way solenoid valve 2, the on / off state of the second branch can be controlled.

[0016] Optionally, fences are respectively provided at the opposite two-side edge positions or three-side edge positions on the lifting platform. The second hydraulic cylinder unit can keep the upper end surface of the supporting platform relatively above and below the upper port of the fence

[0017] Optionally, a seat platform capable of rotating around a vertical axis is provided on the vehicle frame. The lower end of the fixed arm of the gantry is fixedly connected to the seat platform, so that the seat platform can carry the gantry, the lifting platform and the supporting platform to rotate synchronously.

[0018] Optionally, both the two-position four-way solenoid valve 1 and the two-position four-way solenoid valve 2 are single-electric-control pilot-operated solenoid valves.

[0019] Optionally, both the two-position two-way solenoid valve 1 and the two-position two-way solenoid valve 2 are direct-acting solenoid valves.

[0020] The beneficial effects of the present utility model are as follows: The energy-saving control system of the lifting platform provided by the present utility model can convert and utilize the gravitational energy of the goods, helps to reduce the additional energy consumption when the goods move downward, and can achieve the purpose of energy saving. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the first state of the present utility model.

[0022] Figure 2 It is a schematic structural diagram of the second state of the present utility model.

[0023] Figure 3 It is a schematic structural diagram of the first state of the hydraulic pipeline system of the present utility model.

[0024] Figure 4This is the schematic diagram of the second state of the hydraulic pipeline system of the present utility model.

[0025] In the figure: 10 vehicle frame; 20 gantry, 21 fixed arm, 22 movable arm, 23 chain assembly;

[0026] 30 first hydraulic cylinder unit, 301 lower cylinder chamber 1, 302 upper cylinder chamber 1, 31 booster cylinder, 311 one-way valve 1, 312 two-position two-way solenoid valve 1, 313 one-way valve 2, 32 pump 1, 33 two-position four-way solenoid valve 1;

[0027] 40 lifting platform, 41 fence;

[0028] 50 second hydraulic cylinder unit, 501 lower cylinder chamber 2, 502 upper cylinder chamber 2, 51 pump 2, 52 two-position four-way solenoid valve 2, 53 two-position two-way solenoid valve 2; 60 supporting platform; 70 pump station unit. Specific implementation mode

[0029] The structures, ratios, sizes, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present utility model. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "front", "rear", "middle", etc. cited in this specification are only for the convenience of clear narration, and are not used to limit the scope for the implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present utility model.

[0030] As Figures 1 to 2 shown, a lifting platform energy-saving control system includes a pair of gantries 20 installed on the vehicle frame 10, two first hydraulic cylinder units 30 respectively corresponding to and matching the two gantries 20, a lifting platform 40 matching the gantry 20, two second hydraulic cylinder units 50 fixed on the lifting platform 40, and a supporting platform 60. The pump station unit 70 connected to the first hydraulic cylinder unit 30 and the second hydraulic cylinder unit 50 is fixedly arranged on the vehicle frame 10.

[0031] Two gantries 20 are installed on the vehicle frame 10 relatively opposite to each other on the left and right. The gantry 20 includes a pair of fixed arms 21 and a U-shaped movable arm 22. The lower ends of the fixed arms 21 are fixedly connected to the vehicle frame 10, and the closed end of the movable arm 22 faces upward. The movable arm 22 is placed between two relatively front and rear fixed arms 21, and the two are matched through a slide rail structure arranged in the vertical direction. Type groove holes respectively corresponding to and matching the two fixed arms 21 are formed on the left and right sides of the lifting platform 40. After the fixed arms 21 pass through the type groove holes, they extend vertically upward. The lifting platform 40 is matched and connected with the two movable arms 22, so that the two can move up and down synchronously. The hydraulic cylinder body of the first hydraulic cylinder unit 30 is correspondingly arranged between two relatively front and rear fixed arms 21, and the lower part of its hydraulic cylinder body is fixed on the vehicle frame 10, and the upper end of its cylinder rod is matched with the cross plate of the movable arm 22, so as to drive the movable arm 22 and the lifting platform 40 to move up and down synchronously along with the telescopic movement of the first hydraulic cylinder unit 30. A chain assembly 23 is provided on the upper part of the movable arm 22. The chain assembly 23 includes at least a pair of chain drive mechanisms. Both ends of the chain in the chain drive mechanism hang downward and are respectively fixed on the fixed arm 21 and the lifting platform 40. When the first hydraulic cylinder unit 30 drives the movable arm 22 to move up and down, the lifting platform 40 can be lifted by means of the chain. Since the technical content involved in this paragraph belongs to the category of prior art, it will not be elaborated here.

[0032] As Figures 1 to 4 shown, the hydraulic cylinder body of the second hydraulic cylinder unit 50 is vertically fixed on the lifting platform 40, and its cylinder rod extends upward relative to the upper end surface of the lifting platform 40. At the same time, the hydraulic cylinder body of the second hydraulic cylinder unit 50 extends downward relative to the lower end surface of the lifting platform 40. The supporting platform 60 is fixed to the upper end of the cylinder rod of the second hydraulic cylinder unit 50, so that it can move up and down relative to the lifting platform 40 along with the telescopic movement of the cylinder rod of the second hydraulic cylinder unit 50.

[0033] During use, first, the second hydraulic cylinder unit 50 is used to drive the supporting platform 60 to move upward relative to the lifting platform 40 to a suitable height position, and then the goods to be unloaded (from a high place) are placed on the upper end surface of the supporting platform 60.

[0034] The connecting pipelines of the lower cylinder chamber 301 and the upper cylinder chamber 302 of the first hydraulic cylinder unit 30 are matched on the two-position four-way solenoid valve 33, and the flow direction of the hydraulic oil in the two connecting pipelines can be regulated by switching the passage position of the two-position four-way solenoid valve 33. As compared with Figure 3 、 Figure 4 it can be seen.

[0035] The two-position four-way solenoid valve 1-33 is connected to the pump station via two pipelines, and a pump 1-32 is provided on one of the pipelines. Through the pump 1-32, the hydraulic oil of the pump station can be pumped into the lower cylinder chamber 1-301 and the upper cylinder chamber 1-302.

[0036] On the connecting pipeline of the lower cylinder chamber 1-301 of the first hydraulic cylinder unit 30, a first branch is provided between the connection port of the lower cylinder chamber 1-301 and the two-position four-way solenoid valve 1-33.

[0037] A two-position two-way solenoid valve 1-312 and a check valve 2-313 are provided on the first branch. The check valve 2-313 allows the hydraulic oil to flow only from the first branch to the lower cylinder chamber 1-301 of the first hydraulic cylinder unit 30.

[0038] By switching the passage position of the two-position two-way solenoid valve 1-312, the on / off state of the first branch can be controlled.

[0039] The connecting pipelines of the lower cylinder chamber 2-501 and the upper cylinder chamber 2-502 of the second hydraulic cylinder unit 50 are matched on the two-position four-way solenoid valve 2-52, and the flow direction of the hydraulic oil in the two connecting pipelines can be regulated by switching the passage position of the two-position four-way solenoid valve 2-52. As can be seen by comparison Figure 3 、 Figure 4 it can be seen.

[0040] The two-position four-way solenoid valve 2-52 is connected to the pump station via two pipelines, and a pump 2-51 is provided on one of the pipelines. Through the pump 2-51, the hydraulic oil of the pump station can be pumped into the lower cylinder chamber 2-501 and the upper cylinder chamber 2-502.

[0041] On the connecting pipeline of the lower cylinder chamber 2-501 of the second hydraulic cylinder unit 50, a second branch is provided between the connection port of the lower cylinder chamber 2-501 and the two-position four-way solenoid valve 2-52.

[0042] A two-position two-way solenoid valve 2-53, a check valve 1-311 and a booster cylinder 31 are arranged in sequence on the second branch. The check valve 1-311 allows the hydraulic oil to flow only to the booster cylinder 31.

[0043] By switching the passage position of the two-position two-way solenoid valve 2-53, the on / off state of the second branch can be controlled.

[0044] Either the first branch or the second branch is kept in the conducting state, so that the flow direction of the hydraulic oil flowing to and from the booster cylinder 31 can be effectively switched and controlled.

[0045] During operation, the goods are placed on the supporting platform 60 raised to a high position. Each solenoid valve is switched to as Figure 3In the state position shown, the gravitational force of the goods can promote the hydraulic oil in the second lower cylinder chamber 501 to flow into the pressure intensifying cylinder 31, so that the liquid in the pressure intensifying cylinder 31 has a certain internal pressure, thereby realizing the limited recovery of the gravitational energy of the goods.

[0046] That is, the weight of the goods is utilized during the retraction of the piston rod of the second hydraulic cylinder unit 50, which helps to reduce the driving energy consumption. At the same time, the gravitational energy of the goods is also stored for later use. A connecting pipeline can be provided between the pressure intensifying cylinder 31 and the pump station, and a pressure relief valve or an electromagnetic on-off control valve (solenoid valve) can be provided on this connecting pipeline.

[0047] After the supporting platform 60 descends to a suitable position (before the lifting platform 40 has not completely descended to the lowest position), the piston rod of the first hydraulic cylinder unit 30 is made to contract, so that the lifting platform 40 carries the supporting platform 60 and the goods and moves downward simultaneously. Affected by the inertial force of the downward movement of the supporting platform 60, the initial energy consumption when the first hydraulic cylinder unit 30 drives the lifting platform can be reduced.

[0048] After the lifting platform 40 and the supporting platform 60 both reach the lowest position (or after reaching the height position suitable for the operation requirements), the goods placed on the supporting platform 60 can be removed by a mechanical device.

[0049] When the lifting platform 40 is moved upward, each solenoid valve can be switched to the Figure 4 state position shown. The hydraulic oil accumulated in the pressure intensifying cylinder 31 and the hydraulic oil pumped by the first pump 32 can enter the first lower cylinder chamber 301 simultaneously, jointly driving the piston rod of the first hydraulic cylinder unit 30 to extend upward, promoting the use of the collected gravitational energy of the goods in the upward start-up action of the first hydraulic cylinder unit 30, so that when the first hydraulic cylinder unit 30 makes an extended start-up action, the required additional energy consumption is reduced.

[0050] During the process of switching the two-position four-way solenoid valve one 33 and the two-position four-way solenoid valve two 52 to the Figure 3 or Figure 4 state position shown, the two can be switched basically synchronously, that is, the piston rod of the first hydraulic cylinder unit 30 and the piston rod of the second hydraulic cylinder unit 50 extend or retract simultaneously; the two can also be switched sequentially, so that there is a time interval between the piston rod of the first hydraulic cylinder unit 30 and the piston rod of the second hydraulic cylinder unit 50 when they make an extended action and a retracted action.

[0051] Multiple first hydraulic cylinder units 30 and multiple second hydraulic cylinder units 50 are respectively configured as Figure 3 、 Figure 4The hydraulic pipeline system shown, enabling multiple said first hydraulic cylinder units 30 to perform telescopic actions synchronously, and enabling multiple said second hydraulic cylinder units 50 to perform telescopic actions synchronously. That is, the free ends of the piston rods of multiple said first hydraulic cylinder units 30 can synchronously descend at a speed V2 and synchronously ascend at a speed V3; the free ends of the piston rods of multiple said second hydraulic cylinder units 50 can synchronously descend at a speed V1 and synchronously ascend at a speed V4.

[0052] Fences 41 are respectively provided at the three-side edge positions on the lifting platform 40. The second hydraulic cylinder unit 50 can keep the upper end face of the supporting platform 60 relatively above the upper ports of the fences 41 (as Figure 1 shown in the state) and below (as Figure 2 shown in the state).

[0053] The above embodiments are only illustrative of the principles and effects of the present invention, rather than limiting the present invention. There are many aspects of the present invention that can be improved without departing from the overall idea. For those familiar with this technology, without departing from the spirit and scope of the present invention, the above embodiments can be modified or changed. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An energy-saving control system for a lifting platform, comprising a pair of gantry frames installed on a vehicle frame, two first hydraulic cylinder units respectively corresponding to and matching with the two gantry frames, and a lifting platform matching with the two gantry frames; the gantry frame includes a fixed arm and a U-shaped movable arm, and the movable arm and the fixed arm are matched through a slide rail structure arranged in the vertical direction; the lower part of the hydraulic cylinder body of the first hydraulic cylinder unit is fixed on the vehicle frame, and the upper end of the cylinder rod is matched with the cross plate of the movable arm, so as to drive the movable arm to lift and move; after the lifting platform is matched with the two movable arms, it can move up and down with the lifting action of the movable arms; it is characterized in that: It further includes at least a pair of second hydraulic cylinder units fixed on the lifting platform, and a supporting platform; The hydraulic cylinder body of the second hydraulic cylinder unit is vertically fixed on the lifting platform, and its cylinder rod extends upward relative to the upper end face of the lifting platform; the supporting platform is fixed on the upper end of the cylinder rod of the second hydraulic cylinder unit and can be pushed and pulled to move upward and downward relative to the lifting platform; The connecting pipelines of the lower cylinder cavity and the upper cylinder cavity of the first hydraulic cylinder unit are matched with a two-position four-way solenoid valve 1, so that the two-position four-way solenoid valve 1 can regulate the flow direction of the hydraulic oil in the two connecting pipelines; On the connecting pipeline of the lower cylinder cavity of the first hydraulic cylinder unit, a first branch is provided between the connecting port of the lower cylinder cavity and the two-position four-way solenoid valve 1; a two-position two-way solenoid valve 1 and a check valve are provided on the first branch, and the check valve enables the hydraulic oil to only flow from the first branch to the lower cylinder cavity of the first hydraulic cylinder unit; the two-position two-way solenoid valve 1 can regulate the on-off state of the first branch; The connecting pipelines of the lower cylinder cavity and the upper cylinder cavity of the second hydraulic cylinder unit are matched with a two-position four-way solenoid valve 2, so that the two-position four-way solenoid valve 2 can regulate the flow direction of the hydraulic oil in the two connecting pipelines; On the connecting pipeline of the lower cylinder cavity of the second hydraulic cylinder unit, a second branch is provided between the connecting port of the lower cylinder cavity and the two-position four-way solenoid valve 2; a two-position two-way solenoid valve 2, a check valve and a booster cylinder are successively provided on the second branch, and the check valve enables the hydraulic oil to only flow to the booster cylinder, and the two-position two-way solenoid valve 2 can regulate the on-off state of the second branch.

2. The energy-saving control system for the lifting platform according to claim 1, wherein: Fences are respectively provided at the relative two-side edge positions or three-side edge positions on the lifting platform; the second hydraulic cylinder unit can keep the upper end face of the supporting platform relatively above and below the upper port of the fence.

3. The energy-saving control system for the lifting platform according to claim 2, wherein: A seat platform capable of rotating around a vertical axis is provided on the vehicle frame; the lower end of the fixed arm of the gantry is fixedly connected to the seat platform, so that the seat platform can carry the gantry, the lifting platform and the supporting platform to rotate synchronously.

4. The energy-saving control system for a lifting platform according to claim 1, wherein: Both the two-position four-way solenoid valve 1 and the two-position four-way solenoid valve 2 are single-electric-control pilot-operated solenoid valves.

5. The energy-saving control system for the lifting platform according to claim 1 or 4, characterized in that: Both the two-position two-way solenoid valve 1 and the two-position two-way solenoid valve 2 are direct-acting solenoid valves.

Images