Auxiliary parking system for container trucks in the yard

Abstract

This utility model discloses an auxiliary parking system for container trucks in a yard, comprising: a lateral positioning device, including a first laser emitter mounted on a rail-mounted gantry crane in the yard, which projects a lateral positioning baseline onto the ground. The lateral positioning baseline is in a straight line and is used to mark the side position of the container truck when parking; and a longitudinal positioning device, including a second laser emitter mounted on a rail-mounted gantry crane in the yard, which projects a longitudinal positioning baseline onto the ground. The longitudinal positioning baseline is in a straight line and is used to mark the parking position of the container truck near the front end. The lateral and longitudinal positioning baselines intersect perpendicularly on the ground to form a parking cross-shaped reference positioning system. This system enables container trucks to park quickly and accurately in the yard and improves the throughput of the yard.

Description

Technical Field

[0001] This utility model belongs to the technical field of parking auxiliary equipment, and in particular relates to an auxiliary parking system for trucks in a yard. Background Technology

[0002] Currently, automated container yards with a U-shaped layout generally adopt a "point-to-point" direct pickup operation mode. Although this mode improves the theoretical operating capacity by increasing the number of truck operation points, it has exposed significant positioning accuracy problems in actual operation: when the truck parking position deviates, the automated rail-mounted gantry crane (ARMG) cannot complete the container grabbing or placement operation normally. This "small error can lead to huge consequences" situation can force the entire operation process to be interrupted.

[0003] The field investigation revealed that the inaccurate positioning of container trucks mainly manifests in two typical scenarios: (1) Lateral positioning deviation: The safe distance between the container truck and the yard fence is insufficient (usually less than 140cm). Due to the limited turning radius of the U-shaped passage, the driver has to make time-consuming and fuel-consuming U-turns to adjust; (2) Longitudinal positioning deviation: The longitudinal misalignment between the container lock hole and the ARMG spreader exceeds the allowable range (common deviation reaches 1.5m), and the driver has to repeatedly perform forward-backward trial movement of the vehicle.

[0004] Currently, the existing technologies mainly solve the above problems in the following two ways: (1) Relying on the guidance display screen on the truck to provide positioning information, but there may be occasional black screen or screen distortion, which may lead to the loss of key information; and there is a 1.5-3 second delay from the recognition of the rail crane to the screen update, so the positioning information is not updated in time when the truck moves fast; (2) Guiding the truck to stop through voice broadcast instructions, but there is a problem that the truck engine noise is loud, which affects the driver's accurate listening to the instructions; and the metal containers in the yard will form an electromagnetic shielding effect, which will cause the voice instructions to be intermittent or suddenly interrupted.

[0005] Therefore, the technical problem to be solved by this utility model is how to design a technology that is highly accurate, timely, and improves the parking efficiency of trucks in the yard. Utility Model Content

[0006] This invention provides an auxiliary parking system for trucks in a yard, enabling trucks to stop quickly and accurately in the yard and improving the throughput of the yard.

[0007] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0008] This utility model provides an auxiliary parking system for container trucks in a yard, including:

[0009] A lateral positioning device includes a first laser emitter, which is mounted on a rail-mounted crane in the yard. The first laser emitter is used to project a lateral positioning reference line onto the ground. The lateral positioning reference line is in the shape of a straight line and is used to mark the side position of the container truck when it is parked.

[0010] The longitudinal positioning device includes a second laser emitter, which is mounted on a rail-mounted gantry crane in the yard. The second laser emitter is used to project a longitudinal positioning baseline onto the ground. The longitudinal positioning baseline is in the shape of a straight line and is used to mark the parking position of the container on the truck near the front of the truck.

[0011] The horizontal positioning baseline and the vertical positioning baseline intersect perpendicularly on the ground to form a parking cross reference positioning.

[0012] In some embodiments of this application, the lateral positioning device and the longitudinal positioning device further include an adjustment bracket. The adjustment bracket is detachably connected to the rail crane via a quick-release structure. The first laser emitter and the second laser emitter are respectively mounted on the adjustment bracket. The adjustment bracket is used to adjust the installation angle of the first laser emitter and the second laser emitter.

[0013] In some embodiments of this application, the quick-release structure includes a mounting plate and a U-shaped mounting component. The mounting plate is provided with a plurality of mounting holes. The mounting plate is mounted on the rail crane through the U-shaped mounting component and the mounting holes. The adjusting bracket is mounted on the mounting plate.

[0014] In some embodiments of this application, the adjusting bracket includes a first mounting side plate and a second mounting side plate connected together. The first mounting side plate and the second mounting side plate are respectively provided with arc-shaped through holes. The first mounting side plate is detachably mounted on the mounting plate through the arc-shaped through holes. The first laser emitter or the second laser emitter is detachably mounted on the arc-shaped through holes of the second mounting side plate.

[0015] In some embodiments of this application, a shock-absorbing structure is provided between the first laser emitter and the second mounting side plate, and a shock-absorbing structure is provided between the second laser emitter and the second mounting side plate. The shock-absorbing structure is used to counteract the vibration generated when the rail crane moves.

[0016] In some embodiments of this application, the first laser emitter uses a red laser light source; the second laser emitter uses a green laser light source.

[0017] In some embodiments of this application, the auxiliary parking system for trucks in the yard further includes:

[0018] A spreader size acquisition device is installed on the rail-mounted gantry crane. The spreader size acquisition device is used to collect the size of the spreader to reflect the size of the container on the truck.

[0019] A control device is connected to the lifting device for acquiring dimensions, the first laser emitter, and the second laser emitter, respectively.

[0020] The second laser emitter comprises several groups, and the longitudinal positioning reference line projected by each group of the second laser emitter corresponds one-to-one with the size of the container on the truck.

[0021] In some embodiments of this application, the lifting device for acquiring dimensions includes multiple sets of limit switches.

[0022] Compared with existing technologies, the advantages and positive effects of this utility model are as follows: A horizontal positioning baseline is projected onto the ground by a first laser emitter, and a vertical positioning baseline is projected onto the ground by a second laser emitter. The intersection of the horizontal and vertical positioning baselines forms a parking cross-shaped positioning system. Accurate parking positioning can be achieved simply by moving the vehicle to the intersection of the laser lines, eliminating the need for repeated adjustments. This is intuitive and visually clear, reducing manual intervention. Furthermore, the vehicle does not require repeated adjustments or additional onboard guidance equipment or additional guides, significantly reducing parking adjustment time, increasing the overall throughput of the yard, and simplifying subsequent maintenance by reducing the need for onboard guidance equipment or guides, thus lowering costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the lateral positioning baseline in one embodiment of the auxiliary parking system for container trucks in a yard according to this utility model;

[0025] Figure 2 This is a schematic diagram of the longitudinal positioning baseline in one embodiment of the auxiliary parking system for container trucks in a yard according to this utility model;

[0026] Figure 3 This is a schematic diagram showing the intersection of the lateral positioning baseline and the longitudinal positioning baseline in one embodiment of the auxiliary parking system for container trucks in a yard according to this utility model;

[0027] Figure 4 This is a schematic diagram illustrating an embodiment of the auxiliary parking system for container trucks in a yard according to this utility model;

[0028] Figure 5 This is a schematic diagram of the assembly of the quick-release structure and the adjusting bracket in one embodiment of the auxiliary parking system for container trucks in a yard according to this utility model;

[0029] Figure 6 This is a schematic diagram of the assembly of the quick-release structure, adjusting bracket, and electrical room railing in one embodiment of the auxiliary parking system for container trucks in the yard according to this utility model;

[0030] Figure 7 This is a schematic diagram showing the installation angle of the first laser emitter / second laser emitter in one embodiment of the auxiliary parking system for container trucks in a yard according to this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. First laser emitter; 101. Lateral positioning baseline;

[0033] 200. Second laser emitter; 201. Longitudinal positioning baseline; 202. 20-foot second laser emitter; 203. 40-foot second laser emitter; 204. 45-foot second laser emitter;

[0034] 300. Rail-mounted crane; 310. Electrical room; 311. Railing;

[0035] 400. Fence;

[0036] 500. Mounting plate; 501. Mounting hole; 502. U-shaped mounting bracket;

[0037] 601. First mounting side plate; 602. Second mounting side plate; 603. Mounting base; 604. Arc-shaped through hole;

[0038] 700. Container trucks; 701. Containers. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0044] like Figures 1 to 7 As shown, this application provides an auxiliary parking system for container trucks in a yard. Through intuitive ground laser guidance, it helps truck drivers quickly and accurately park at the target work location. The auxiliary parking system for container trucks in a yard includes:

[0045] The lateral positioning device includes a first laser emitter 100, which is mounted on a rail-mounted crane 300 in the yard. The first laser emitter 100 is used to project a lateral positioning reference line 101 onto the ground. The lateral positioning reference line 101 is in the shape of a straight line and is used to mark the side position of the container truck 700 when it is parked.

[0046] The longitudinal positioning device includes a second laser emitter 200, which is mounted on a rail-mounted gantry crane 300 in the yard. The second laser emitter 200 is used to project a longitudinal positioning reference line 201 onto the ground. The longitudinal positioning reference line 201 is in the shape of a straight line and is used to mark the parking position of the container 701 on the truck 700 near the front of the truck.

[0047] The intersection of the lateral positioning baseline 101 and the longitudinal positioning baseline 201 forms a parking cross-shaped positioning reference.

[0048] Specifically, both the first laser emitter 100 and the second laser emitter 200 use a 1000mw high-power laser source, with an outdoor visibility distance of up to 15 meters and a clear straight line 3-5 meters long projected onto the ground, in order to meet the operational needs under different weather conditions.

[0049] When the truck needs to stop, the first laser emitter 100 projects a lateral positioning reference line 101 onto the ground. The distance between the projected lateral positioning reference line 101 and the yard fencing 400 can be adjusted by changing the projection angle of the first laser emitter 100. In this embodiment, the distance between the lateral positioning reference line 101 and the yard fencing 400 is 140cm. Figure 1 As shown, the lateral positioning baseline 101 provides a clear lateral parking boundary for the truck driver. By observing through the rearview mirror, the driver adjusts the vehicle body to ensure the rear wheels are parallel to and do not cross the lateral positioning baseline 101, thus ensuring the vehicle body does not cross the baseline. This effectively avoids the need for turning around due to insufficient lateral clearance, significantly reducing the time required to adjust the vehicle position and improving transportation efficiency. The installation angles of the first laser emitter 100 and the second laser emitter 200 are as follows: Figure 7 As shown, the calculation formula is as follows:

[0050] ;

[0051] in, This indicates the angle between the first laser emitter 100 or the second laser emitter 200 and the wall of the electrical room 310; This indicates the horizontal distance between the first laser emitter 100 or the second laser emitter 200 and the perimeter fence 400; This indicates the distance from the perimeter fence 400 to the target parking position of the container truck 700; This indicates the height of the first or second laser emitter above the ground.

[0052] Then, the second laser emitter 200 projects a longitudinal positioning reference line 201 onto the ground. The longitudinal positioning reference line 201 can accurately mark the theoretical position of the lock hole of container 701, such as... Figure 2 As shown, the driver only needs to align the longitudinal positioning baseline 201 with the edge of the side of the container 701 to ensure that the spreader operates accurately and grabs the container 701 on the truck 700.

[0053] Both the lateral and longitudinal positioning devices include adjusting brackets, which are detachably connected to the rail-mounted crane 300 via a quick-release structure. The first laser emitter 100 and the second laser emitter 200 are respectively mounted on the adjusting brackets, which are used to adjust the installation angles of the first laser emitter 100 and the second laser emitter 200. The quick-release structure makes it easy to assemble and disassemble the first laser emitter 100 and the second laser emitter 200, facilitating future inspection and maintenance.

[0054] like Figure 5 , Figure 6 As shown, the quick-release structure includes a mounting plate 500 and a U-shaped mounting bracket 502. The mounting plate 500 has several mounting holes 501. The mounting plate 500 is installed on the rail-mounted crane 300 through the U-shaped mounting bracket 502 and the mounting holes 501. The mounting plate 500 is a rectangular perforated flat iron, and the U-shaped mounting bracket 502 is a U-shaped metal clamp. During installation, the mounting plate 500 is placed on one side of the railing 311 of the electrical room 310 of the rail-mounted crane 300, and then fixed by the U-shaped mounting bracket 502 and bolts and nuts. Installing the adjustment bracket on the railing 311 of the electrical room 310 through the U-shaped mounting bracket 502 and the mounting plate 500 has the following advantages compared to installing it in other positions on the rail-mounted crane 300: disassembly and assembly can be completed without hot work (such as welding), and the implementation process is efficient and convenient; the railing 311 of the electrical room 310 is an external extension of the rail-mounted crane 300, and the first laser emitter 100 and the second laser emitter 200 will not be obstructed or interfered with by other objects.

[0055] like Figure 5 , Figure 6 As shown, the adjustment bracket is mounted on the mounting plate 500. The adjustment bracket includes a first mounting side plate 601 and a second mounting side plate 602 connected together. Preferably, the first mounting side plate 601 and the second mounting side plate 602 are integrally formed.

[0056] The first mounting side plate 601 and the second mounting side plate 602 are respectively provided with arc-shaped through holes 604. The first mounting side plate 601 is detachably mounted on the mounting plate 500 through the arc-shaped through holes 604 and bolts and nuts. The first laser emitter 100 and the second laser emitter 200 are both connected to mounting bases 603. The mounting bases 603 are detachably connected to the arc-shaped through holes 604 of the second mounting side plate 602 through bolts and nuts. When the mounting bases 603 are installed in different positions within the arc-shaped through holes 604, the first laser emitter 100 or the second laser emitter 200 can be installed at different heights and horizontal positions in conjunction with the mounting bases 603, thereby shooting out horizontal positioning reference lines 101 or vertical positioning reference lines 201 at different angles according to production needs.

[0057] The first mounting side plate 601 and the second mounting side plate 602 are made of aerospace aluminum alloy. Aerospace aluminum alloy has the advantages of high strength and low weight, making it easy to install and use in the yard.

[0058] A vibration damping structure is provided between the first laser emitter 100 and the second mounting side plate 602, and a vibration damping structure is provided between the second laser emitter 200 and the second mounting side plate 602. The vibration damping structure is used to offset the vibration generated when the rail-mounted gantry crane 300 moves. The vibration damping structure can be a vibration damping spring, which is installed on the mounting base 603 between the first laser emitter 100 or the second laser emitter 200 (not shown in the figure), forming a hidden vibration damping structure. The first laser emitter 100 and the second laser emitter 200 can offset the vibration generated when the rail-mounted gantry crane 300 moves through the vibration damping spring, ensuring that the first laser emitter 100 and the second laser emitter 200 stably project the parking reference line.

[0059] like Figure 3 , Figure 4 As shown, the first laser emitter 100 uses a red laser light source with a wavelength of 650nm±10nm; the second laser emitter 200 uses a green laser light source with a wavelength of 532nm±10nm. Both the red and green laser light sources are high-power 1000mW laser sources, with an outdoor visibility distance of up to 15 meters, and a clear straight line 3-5 meters long projected onto the ground, adapting to operational needs under different weather conditions. The use of different colors for the lateral positioning baseline 101 and the green parking baseline makes it easier for the driver to distinguish them intuitively, improving parking accuracy.

[0060] The auxiliary parking system for container trucks in the yard also includes:

[0061] A spreader size acquisition device is installed on the rail-mounted gantry crane 300. This device collects the dimensions of the spreader to reflect the dimensions of the container 701 on the truck 700. The spreader size acquisition device includes multiple limit switches (not shown in the figures). Since there are various sizes of containers 701 during transportation, the spreader of the rail-mounted gantry crane 300 adjusts its size when grabbing the container 701. In this application, the dimensions of the container 701 are illustrated using 20-foot, 40-foot, and 45-foot examples. For example, if the container 701 is 20 feet, the spreader needs to extend to the size required to grab the 20-foot container 701 before the limit switch detects this and the spreader stops extending. Therefore, by setting limit switches at different positions on the rail-mounted gantry crane 300, the size of the spreader can be detected, thus obtaining the dimensions of the container 701 on the truck.

[0062] The control device is connected to the spreader size acquisition device, the first laser emitter 100, and the second laser emitter 200, respectively. The second laser emitter 200 includes several groups, and the longitudinal positioning reference line 201 projected by each group of second laser emitters 200 has a different angle with the ground, and each group of longitudinal positioning reference lines 201 corresponds one-to-one with the size of the container 701 on the truck 700.

[0063] The control device can be a PLC controller. The control device uses the dimensions of the lifting device to collect the dimensions of the lifting device to activate different second laser emitters 200.

[0064] In operation, when the rail-mounted gantry crane 300 receives a lifting operation command, the control device activates the lateral positioning device, projecting a red lateral positioning reference line 101 onto the ground. The truck driver observes the lateral positioning reference line 101 through the rearview mirror and adjusts the vehicle body to ensure that the rear wheels of the truck 700 are parallel to the lateral positioning reference line 101 and do not cross it. Then, the control device obtains the dimensions of the spreader and the container 701 based on the limit switches and activates the corresponding longitudinal positioning device, projecting a green longitudinal positioning reference line 201 onto the ground. The truck driver adjusts the position of the truck 700 so that the side of the container 701 coincides with the longitudinal positioning reference line 201. At this point, the deviation between the center line of the spreader and the locking hole of the container 701 is less than 3cm, completing precise parking. It should be noted that this application does not involve software improvements.

[0065] If a 20-foot container is being lifted, the second 20-foot laser emitter 202 is activated, projecting a green longitudinal positioning baseline 201 3.2 meters from the truck cab to correspond to the position of the 20-foot container's lock hole. If a 40-foot container is being lifted, the second 40-foot laser emitter 203 is activated, projecting a green longitudinal positioning baseline 201 6.4 meters from the truck cab to correspond to the position of the 40-foot container's lock hole. If a 45-foot container is being lifted, the second 45-foot laser emitter 204 is activated, projecting a green longitudinal positioning baseline 201 7.2 meters from the truck cab to correspond to the position of the 45-foot container's lock hole.

[0066] The yard support system provided in this application enables 700 trucks to stop blindly, making the parking process visually aligned, which greatly improves the operational efficiency and safety of U-shaped yards.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

[0069] Whenever possible, the various aspects and features described and shown in the specification can be applied individually, and these individual aspects can serve as the subject of a divisional application.

Claims

1. An auxiliary parking system for a tractor trailer within a yard, the system comprising: include: A lateral positioning device includes a first laser emitter, which is mounted on a rail-mounted crane in the yard. The first laser emitter is used to project a lateral positioning reference line onto the ground. The lateral positioning reference line is in the shape of a straight line and is used to mark the side position of the container truck when it is parked. The longitudinal positioning device includes a second laser emitter, which is mounted on a rail-mounted gantry crane in the yard. The second laser emitter is used to project a longitudinal positioning baseline onto the ground. The longitudinal positioning baseline is in the shape of a straight line and is used to mark the parking position of the container on the truck near the front of the truck. The horizontal positioning baseline and the vertical positioning baseline intersect perpendicularly on the ground to form a parking cross reference positioning.

2. The auxiliary parking system of the tractor trailer in the yard according to claim 1, characterized in that, The lateral positioning device and the longitudinal positioning device each further include an adjustment bracket. The adjustment bracket is detachably connected to the rail crane via a quick-release structure. The first laser emitter and the second laser emitter are respectively mounted on the adjustment bracket. The adjustment bracket is used to adjust the installation angle of the first laser emitter and the second laser emitter.

3. The auxiliary parking system of the tractor trailer in the yard according to claim 2, characterized in that, The quick-release structure includes a mounting plate and a U-shaped mounting component. The mounting plate is provided with several mounting holes. The mounting plate is mounted on the rail crane through the U-shaped mounting component and the mounting holes. The adjusting bracket is mounted on the mounting plate.

4. The auxiliary parking system of the tractor trailer in the yard according to claim 3, characterized in that, The adjustment bracket includes a first mounting side plate and a second mounting side plate connected together. The first mounting side plate and the second mounting side plate are respectively provided with arc-shaped through holes. The first mounting side plate is detachably mounted on the mounting plate through the arc-shaped through holes. The first laser emitter or the second laser emitter is detachably mounted on the arc-shaped through holes of the second mounting side plate.

5. The auxiliary parking system of the tractor trailer in the yard according to claim 4, characterized in that, A shock-absorbing structure is provided between the first laser emitter and the second mounting side plate, and a shock-absorbing structure is provided between the second laser emitter and the second mounting side plate. The shock-absorbing structure is used to counteract the vibration generated when the rail crane moves.

6. The auxiliary parking system of a tractor trailer truck in a yard according to claim 1, wherein, The first laser emitter uses a red laser light source; the second laser emitter uses a green laser light source.

7. The auxiliary parking system of a tractor trailer in a yard according to any one of claims 1-6, wherein, Also includes: A spreader size acquisition device is installed on the rail-mounted gantry crane. The spreader size acquisition device is used to collect the size of the spreader to reflect the size of the container on the truck. A control device is connected to the lifting device for acquiring dimensions, the first laser emitter, and the second laser emitter, respectively. The second laser emitter comprises several groups, and the longitudinal positioning reference line projected by each group of the second laser emitter corresponds one-to-one with the size of the container on the truck.

8. The auxiliary parking system for container trucks in the yard according to claim 7, characterized in that, The lifting device for acquiring dimensions includes multiple sets of limit switches.

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