Lifting platform loading device and method based on multi-cylinder jacking

Abstract

The invention provides a lifting platform truck loading device based on multi-cylinder jacking, which is applied to a transportation flat car and comprises a cargo loading platform, a lifting platform, a lifting platform and a lifting platform, the supporting structure is movably connected with the cargo carrying platform and used for supporting the cargo carrying platform and fixing the supporting leg oil cylinder; the supporting leg oil cylinders are symmetrically arranged on the two sides of the supporting structure and used for achieving lifting of the cargo carrying platform. The hydraulic station is connected with the cargo carrying platform and used for providing pressure for the supporting leg oil cylinders and controlling the oil cylinders to ascend and descend. The technical problems that in the prior art, under the condition that the rigidity of a lifting structure is poor, the influence of uneven ground cannot be overcome, all oil cylinders are independently controlled through a proportional valve and a displacement sensor, and synchronous jacking is achieved through closed-loop control are solved.

Description

Technical Field

[0001] The present application relates to the technical field of flatbed truck transportation, and in particular to a lifting platform loading device and method based on multi-cylinder jacking. Background Art

[0002] In the transport environment of industrial parks (such as steel mills), cargo is usually transported by flatbed trucks, and a "liftable hydraulic flatbed truck + non-powered platform" is used to achieve a transport form in which the chassis and cargo box can be separated. However, the liftable hydraulic flatbed truck is expensive, has a low speed, and has high maintenance costs. In addition, traditional hydraulic jacking technology has high requirements for structural rigidity. For lifting platforms with poor rigidity, it is impossible to connect the oil circuits of each cylinder and achieve synchronization through the rigidity of the "structure" itself; however, if "proportional valve + displacement sensor" is used to control each cylinder individually, closed-loop control is easily affected by uneven ground, making it difficult to achieve synchronous jacking. Summary of the invention

[0003] In view of this, the present invention provides a lifting platform loading device and method based on multi-cylinder jacking to solve the technical problem that the prior art cannot overcome the influence of uneven ground when the rigidity of the lifting structure is poor, and adopts "proportional valve + displacement sensor" to individually control each cylinder, closed-loop control, and realize synchronous jacking.

[0004] The present invention provides a lifting platform loading device based on multi-cylinder jacking, which is applied to a transport flatbed truck, and the device includes: a cargo platform for loading cargo; a supporting structure, which is movably connected to the cargo platform and is used to support the cargo platform and fix the outrigger cylinders; a plurality of outrigger cylinders, which are symmetrically arranged on both sides of the supporting structure and are used to realize the lifting of the cargo platform; a hydraulic station, which is connected to the cargo platform and is used to provide pressure for the outrigger cylinders and control the lifting of the cylinders.

[0005] Furthermore, the outrigger oil cylinder comprises: an oil cylinder including a rod chamber and a rodless chamber, which is used for lifting and lowering by oil pressure; and a displacement sensor, which is arranged inside the oil cylinder and is used for detecting the displacement of the oil cylinder.

[0006] Furthermore, the oil cylinder includes: a support plate for determining the zero point position; a cylinder body connected to the support plate and used to contain pressurized oil; a piston connected to the support plate and built into the cylinder body, dividing the cylinder body into two, wherein half of the cylinder body close to the support plate is a rod chamber, and the other half of the cylinder body away from the support plate is a rodless chamber.

[0007] Furthermore, the outrigger oil cylinder also includes: a rodless chamber pressure sensor, connected to the rodless chamber, for detecting the oil pressure in the rodless chamber; a rodless chamber solenoid valve, connected to the rodless chamber, for connecting or cutting off the oil volume in the rodless chamber; a hydraulic lock, connected to the rodless chamber solenoid valve, for locking the oil circuit to keep the oil cylinder in a stopped position.

[0008] The present invention provides a method for a loading device of a lifting platform based on multi-cylinder lifting, the method comprising: step 1, a supporting structure is supported on the ground, and the height of the cargo platform from the ground is h1; step 2, the supporting plate moves toward the ground under pressure P1, and the rodless chamber solenoid valve is disconnected at the same time, so that the oil circuits of each oil cylinder are connected and the pressure of the rodless oil chamber is reduced; step 3, after the supporting plate contacts the ground, the hydraulic station and the electrical system provide pressure for the outrigger oil cylinder, so that the pressure of the rodless oil chamber rises to P2, and the position reached by the oil cylinder at this time is recorded as the zero position; step 4, cutting off the oil circuits connecting each oil cylinder, and by controlling a proportional valve and a displacement sensor, each oil cylinder is lifted synchronously by the pressure provided by the hydraulic station and the electrical system, and is lifted from the zero point to the target position, so that the height of the cargo platform from the ground is h2; step 5, after a flatbed truck enters under the cargo platform, each oil cylinder is synchronously lowered by controlling the proportional valve and the displacement sensor until the oil cylinder retracts to the bottom, so that the cargo platform is placed on the flatbed truck, and the loading is completed.

[0009] Furthermore, the method also includes: step 6, after the flatbed truck completes loading and arrives at the destination, it drives into between the outrigger cylinders; step 7, each cylinder synchronously lifts by controlling the proportional valve and the displacement sensor until the cargo platform on the flatbed truck is completely lifted; step 8, the flatbed truck drives out, and the cargo platform is placed on the supporting structure to complete unloading.

[0010] Furthermore, the target position is the position reached by the oil cylinder when the rodless chamber pressure reaches P3.

[0011] Furthermore, P2 is a safety oil pressure which does not exceed the bearing capacity of the lifting platform structure to ensure that the structure does not produce permanent deformation.

[0012] Furthermore, the P1 <P2。

[0013] Furthermore, the step 4 also includes: when the height of the cargo platform from the ground reaches h2, the oil circuit is locked by a hydraulic lock so that the oil cylinder stops lifting.

[0014] The present invention provides a lifting platform loading device and method based on multi-cylinder lifting, which adopts the transportation mode of "traditional electric-driven flatbed vehicle + powered lifting platform" to achieve low-cost and high-efficiency transportation. This technical solution can overcome the influence of uneven ground when the lifting structure has poor rigidity, and adopts "proportional valve + displacement sensor" to control each oil cylinder separately, closed-loop control, and achieve synchronous lifting, thus solving the problem of permanent deformation of the structure due to poor rigidity of the lifting platform structure in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a lifting platform provided by the present invention; Figure 2It is a schematic diagram of another lifting platform provided by the present invention; Figure 3 It is a schematic diagram of an outrigger oil cylinder provided by the present invention; Figure 4 It is a hydraulic principle diagram of a jacking system provided by the present invention; Figure 5 It is a schematic flow chart of a method for loading a vehicle on a lifting platform based on multi-cylinder lifting provided by the present invention; Figure 6-9 It is a schematic diagram of the loading and transportation of the lifting platform provided by the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Device Item Example: The present invention provides a lifting platform loading device based on multi-cylinder lifting, which is applied to transport flatbed trucks, such as Figure 1 As shown, the device includes a cargo platform 9, a supporting structure 10, a plurality of outrigger cylinders 1, and a hydraulic station 8.

[0018] The cargo platform 9, i.e., the platform beam (such as Figure 1 The filled part with diagonal lines in the middle) is used to load cargo.

[0019] The support structure 10 is movably connected to the cargo platform 9, and is used to support the cargo platform 9 and fix the outrigger cylinder 1. The support structure 10 is movably connected to the cargo platform 9, which means that the cargo platform 9 can be removed from the support structure 10, rather than being fixedly connected. For example, after the flatbed truck is loaded, it will leave the support structure and take away the cargo platform 9 with the steel coils; and after the flatbed truck is unloaded, the cargo platform 9 with the steel coils will be left on the support structure 10, and the vehicle will drive away on its own to carry out the next cargo loading and unloading.

[0020] The outrigger oil cylinder 1 is non-fixedly connected to the cargo platform 9 and symmetrically placed on both sides of the cargo platform 9 to realize the lifting and lowering of the cargo platform 9. Figure 2 As shown, multiple outrigger oil cylinders 1 are respectively located below both sides of the cargo platform 9, so the outrigger oil cylinders 1 are usually an even number, for example, six outrigger oil cylinders 1, and the number of oil cylinders can also be increased or decreased as needed. Figure 3As shown, the outrigger oil cylinder 1 includes an oil cylinder 11 and a displacement sensor 12. The oil cylinder 11 includes a rod chamber and a rodless chamber 111, which are used for lifting and lowering by oil pressure; the displacement sensor 12 is arranged inside the oil cylinder 11, and is used for detecting the displacement of the oil cylinder 11. The oil cylinder 11 includes a support plate 13, a cylinder body 14 and a piston (not marked in the figure). The support plate 13 is in contact with the ground, and is used to support the cargo platform 9; the cylinder body 14 is connected to the support plate 13, and is used to contain pressure oil; the piston is connected to the support plate 13, and is built into the cylinder body 14, dividing the cylinder body 14 into two, wherein the half of the cylinder body close to the support plate 13 is a rod chamber, and the other half of the cylinder body away from the support plate 13 is a rodless chamber 111. The outrigger oil cylinder 1 also includes a rodless chamber pressure sensor 112, a rodless chamber solenoid valve 4, and a hydraulic lock 2 (such as Figure 4 As shown). Among them, the rodless chamber pressure sensor 112 is connected to the rodless chamber 111 and is used to detect the oil pressure of the rodless chamber 111; the rodless chamber solenoid valve 4 is connected to the rodless chamber 111 and is used to connect or cut off the oil volume of the rodless chamber 111; the hydraulic lock 2 is connected to the rodless chamber solenoid valve 4 and is used to lock the oil circuit to keep the oil cylinder 11 in the stop position. Since there is pressure only in the rodless chamber 111 and not in the rod chamber during the entire lifting process of the outrigger oil cylinder, since the rodless chamber does not involve this technical solution, it is not described in detail in this application.

[0021] The hydraulic station 8 is connected to the cargo platform 9 and is used to provide pressure to the outrigger cylinder 1 to control the lifting of the cylinder 11.

[0022] The present invention provides a lifting platform loading device based on multi-cylinder jacking, which controls the lifting of the cargo platform 9 through the outrigger oil cylinder 1 to complete the loading and unloading of goods. Since the outrigger oil cylinder 1 is placed on the ground, it only needs to be installed at the loading and unloading point, and there is no need to set the lifting structure on a flatbed truck like the traditional transportation method. Purchasing a special hydraulic flatbed truck or modifying an ordinary flatbed truck requires a high cost, so this technical solution can effectively reduce costs.

[0023] Method Item Example: The present invention provides a method for loading a vehicle on a lifting platform based on multi-cylinder lifting, such as Figure 5 As shown, the method steps are as follows.

[0024] Step 1, the supporting structure is supported on the ground, and the height of the cargo platform from the ground is h1; like Figure 1 As shown, the support structure 10 is supported on the ground, and the cargo platform 9, namely the platform beam, is at a height h1 from the ground. The support structure 10 mainly bears the load.

[0025] Step 2: the support plate moves toward the ground under pressure P1, and the rodless chamber solenoid valve is disconnected at the same time, so that the oil circuits of each cylinder are connected and the pressure of the rodless oil chamber is reduced; As can be seen from the above, there are usually multiple outrigger cylinders 1, and the number is even. For example Figure 2 shown, there are six outrigger cylinders 1, and each outrigger cylinder 1 is provided with a cylinder 11. As Figure 6 shown, since the lifting platform is placed on the ground, and the ground is mostly uneven. After the cylinder 11 extends, the support plate 13 first runs to contact the ground under the action of the small oil pressure P1, which is also called the no-load stroke. At this time, the cylinder has no load, and the oil cylinders are connected, and the oil pressure in the rodless cavity is relatively small, assumed to be P1, and P1 < P2. And during this stroke, the oil circuits of the oil cylinders are connected, and by restricting the oil pressure (lower than P2), each oil cylinder will run under the pressure P1 until the support plate 13 contacts the ground. When all the support plates 13 contact the ground, the pressure in the rodless cavity 111 rises from P1 to P2, and at this time all the oil cylinders reach the zero position.

[0026] Step 3, after the support plate contacts the ground, the hydraulic station provides pressure for the outrigger cylinder, so that the pressure in the rodless cavity rises to P2, and the position where the oil cylinder arrives at this time is recorded as the zero position; After step 2, the support plate contacts the ground. After the rodless cavity 111 is pressurized by the hydraulic station 8, the pressure oil in the hydraulic station 8 flows into the rodless cavity 111, so that the oil pressure continuously rises until P2. When starting to contact the ground and during the process of ground compaction, the displacement of the oil cylinder is small, but the oil pressure in the rodless cavity rises rapidly and will reach P2 first. At this time, the oil cylinder 11 can overcome the load, and the support structure of the lifting platform begins to leave the ground. After顶升 to the target height, the oil cylinder 11 stops running. During the顶升 process, the platform needs to be kept horizontal to prevent the steel coil from rolling. Moreover, the structure of the lifting platform is rigidly poor. If the oil cylinders are not synchronized, it may cause permanent deformation of the structure. If the position when each oil cylinder contacts the ground is defined as "zero", from zero to the end of顶升, the positions of each oil cylinder should be synchronized, such as the displacement difference is not greater than △L, but before zero, there is no synchronization requirement between the oil cylinders.

[0027] Step 4, cut off the connected oil circuits of each oil cylinder. Through the control of the proportional valve and the displacement sensor, and the pressure provided by the hydraulic station and the electrical system, each oil cylinder顶升synchronously, from the zero position to the target position, so that the height of the cargo platform from the ground is h2; Cut off the connected oil circuits of the oil cylinders through the rodless cavity solenoid valve 4, so that each oil cylinder is controlled separately. According to the "proportional valve + displacement sensor" closed-loop control, multiple oil cylinders 11 start from the zero position and顶升synchronously to the target position. During the synchronous顶升 process, the pressure in the rodless cavity 111 will reach P3, so that the support structure begins to leave the ground, and the height of the cargo platform from the ground is h2. At this time, the position where the oil cylinder 11 arrives is the target position. As Figure 7 shown, the height h2 can be adjusted to be suitable for the flatbed truck to enter smoothly. In addition, the "proportional valve + displacement sensor" closed-loop control is an existing technology and will not be elaborated here.

[0028] Step 5: After the flatbed truck drives under the loading platform, each oil cylinder synchronously descends through controlling the proportional valve and displacement sensor until the oil cylinder retracts to the end, placing the loading platform on the flatbed truck to complete the loading. As Figure 8 , 9 shown, the lifting platform descends, causing the loading platform to completely land on the flatbed truck. At this time, the height of the loading platform from the ground is h3, and h3 < h2. Since the loading platform is not fixedly placed on the leg oil cylinders, when the loading platform completely lands on the flatbed truck and the flatbed truck drives out, the loading platform will move with the flatbed truck. The descent control of the loading platform can adopt closed-loop synchronous control throughout the process until the oil cylinder retracts to the end.

[0029] Step 6: After the flatbed truck that has completed loading reaches the destination, it drives between the leg oil cylinders. Step 7: Each oil cylinder synchronously顶升 through controlling the proportional valve and displacement sensor until the loading platform on the flatbed truck is completely lifted. Step 8: The flatbed truck drives out, and the loading platform is placed on the support structure to complete the unloading.

[0030] After the vehicle reaches the destination, the loading platform is unloaded, and the process of its unloading operation is opposite to the loading process.

[0031] In summary, the embodiment of the present invention provides a lifting platform loading device and method based on multi-cylinder顶升, adopting a transportation mode of "traditional electric-driven flatbed truck + power-driven liftable platform" to achieve low-cost and high-efficiency transportation. This technical solution can overcome the influence of uneven ground when the rigidity of the lifting structure is poor, and adopt "proportional valve + displacement sensor" to control each oil cylinder separately, with closed-loop control to achieve synchronous顶升, solving the problem in the prior art that due to the poor rigidity of the lifting platform structure, permanent deformation of the structure occurs, and at the same time solving the problems of high price, low vehicle speed, and high maintenance cost in the prior art.

[0032] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lifting platform loading device based on multi-cylinder jacking, applied to a transport flatbed truck, characterized in that: The device comprises: Cargo platform, used for loading cargo; A supporting structure, movably connected to the cargo platform, used to support the cargo platform and fix the outrigger cylinders; Several outrigger cylinders are symmetrically arranged on both sides of the supporting structure to realize the lifting and lowering of the cargo platform; The hydraulic station is connected to the cargo platform and is used to provide pressure to the outrigger cylinders and control the lifting of the cylinders.

2. According to claim 1, a lifting platform loading device based on multi-cylinder jacking is characterized in that: The outrigger oil cylinder comprises: The oil cylinder includes a rod chamber and a rodless chamber, and is used for lifting and lowering by oil pressure; The displacement sensor is arranged inside the oil cylinder and is used to detect the displacement of the oil cylinder.

3. According to claim 2, a lifting platform loading device based on multi-cylinder jacking is characterized in that: The oil cylinder comprises: A support plate, used to determine the zero point position; a cylinder body, connected to the support plate, for containing the pressurized oil; The piston is connected to the support plate and is built into the cylinder body, dividing the cylinder body into two parts, wherein the half of the cylinder body close to the support plate is a rod cavity, and the other half of the cylinder body away from the support plate is a rodless cavity.

4. According to claim 2, a lifting platform loading device based on multi-cylinder jacking is characterized in that: The outrigger oil cylinder also includes: A rodless cavity pressure sensor is connected to the rodless cavity and is used to detect the oil pressure of the rodless cavity; A rodless chamber solenoid valve is connected to the rodless chamber and is used to connect or cut off the oil volume in the rodless chamber; The hydraulic lock is connected to the rodless chamber solenoid valve and is used to lock the oil circuit to keep the cylinder in the stopped position.

5. A method for loading a vehicle using the lifting platform device based on multi-cylinder lifting as described in claims 1-4, characterized in that: The method comprises: Step 1, the supporting structure is supported on the ground, and the height of the cargo platform from the ground is h1; Step 2: the support plate moves toward the ground under pressure P1, and the rodless chamber solenoid valve is disconnected at the same time, so that the oil circuits of each cylinder are connected and the pressure of the rodless oil chamber is reduced; Step 3: After the support plate contacts the ground, the hydraulic station provides pressure to the outrigger cylinder, so that the pressure in the rodless oil chamber rises to P2. The position reached by the cylinder at this time is recorded as the zero position; Step 4, cut off the oil circuits connecting the cylinders, and by controlling the proportional valves and displacement sensors, and the pressure provided by the hydraulic station and the electrical system, the cylinders are lifted synchronously, starting from the zero point to the target position, so that the height of the cargo platform from the ground is h2; Step 5, after the flatbed truck drives under the loading platform, each cylinder descends synchronously by controlling the proportional valve and displacement sensor until the cylinder retracts to the bottom, so that the loading platform is placed on the flatbed truck and loading is completed.

6. A method for loading a vehicle on a lifting platform based on multi-cylinder jacking according to claim 5, characterized in that: The method further comprises: Step 6: After the loaded flatbed truck arrives at the destination, it drives between the outrigger cylinders; Step 7, each oil cylinder is lifted synchronously by controlling the proportional valve and the displacement sensor until the cargo platform on the flatbed truck is fully lifted; Step 8: The flatbed truck drives out and the cargo platform is placed on the supporting structure to complete the unloading.

7. According to claim 5, a multi-cylinder lifting control method based on a lifting platform is characterized in that: The target position is the position reached by the cylinder when the rodless chamber pressure reaches P3.

8. The multi-cylinder lifting control method based on a lifting platform according to claim 5 is characterized in that: The P2 is a safety oil pressure which does not exceed the bearing capacity of the lifting platform structure to ensure that the structure does not produce permanent deformation.

9. The multi-cylinder lifting control method based on a lifting platform according to claim 5, characterized in that: The P1 <P2。 10. The multi-cylinder lifting control method based on a lifting platform according to claim 5, characterized in that: The step 4 also includes: when the height of the cargo platform from the ground reaches h2, the oil circuit is locked by a hydraulic lock so that the oil cylinder stops lifting.

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