Mobile transfer platform for cold chain logistics

Abstract

The utility model discloses a mobile switching platform for cold chain logistics, including transplanting device, buffer room and compact sealing structure, and buffer room is hollow structure, and its bottom plate is installed on transplanting device, and buffer room has first docking interface with loading and unloading mouth butt joint and second docking interface with refrigerated truck butt joint, and the included angle of second docking interface and cold storage outer wall is acute angle, makes refrigerated truck relative cold storage oblique parking. The mobile switching platform of the utility model can rotate to non-loading and unloading mouth place when not using, ensures normal parking loading and unloading operation of the loading and unloading mouth, improves utilization rate, in addition, can be moved to loading and unloading mouth place when using, can seal connection of the loading and unloading mouth of thoroughfare and vehicle tail as far as possible, reduces cold loss, furthermore, the buffer room of the utility model makes vehicle relative warehouse outer wall inclined parking, reduces the requirement to loading and unloading area depth, improves land utilization.

Description

Technical Field

[0001] This utility model relates to the field of loading and unloading goods in cold chain materials, and in particular to a mobile transfer platform for cold chain logistics. Background Technology

[0002] Cold storage facilities typically have multiple loading and unloading bays (with door seals) spaced along their exterior walls to accommodate refrigerated trucks, facilitating simultaneous loading and unloading and improving operational efficiency. During loading and unloading, the refrigerated truck's body is perpendicular to the cold storage wall, with its rear extending into the loading and unloading bay to ensure efficiency and minimize cold loss. Currently, refrigerated trucks on the market range in length from 4 to 22 meters. Although the proportion of large refrigerated trucks is relatively low, loading and unloading areas still need to accommodate their needs. Existing loading and unloading methods require the loading and unloading area outside the cold storage area to be approximately 50 meters deep, resulting in a large loading and unloading area and wasted land. Furthermore, some older cold storage facilities have very limited operating space, insufficient to meet the loading and unloading needs of refrigerated trucks. Summary of the Invention

[0003] In view of this, the present invention proposes a mobile transfer platform for cold chain logistics, which can be flexibly adjusted between loading and unloading ports of cold storage and can also significantly improve the utilization rate of loading and unloading areas.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The mobile transfer platform for cold chain logistics described in this utility model includes an X-shaped guide rail parallel to the outer wall of the cold storage, a transplanting device that travels along the X-shaped guide rail, a buffer room set on the transplanting device, and a pressing and sealing structure set on the side wall of the buffer room. The buffer room is a hollow structure formed by a top plate, a bottom plate, a first side plate, and a second side plate. The bottom plate is horizontally installed on the transplanting device. The buffer room has a first pair of interfaces that connect with the loading and unloading port and a second pair of interfaces that connect with the refrigerated truck. The first pair of interfaces is a rectangular opening parallel to the outer wall of the cold storage, and the second pair of interfaces forms an acute angle with the outer wall of the cold storage, so that the refrigerated truck is parked obliquely relative to the cold storage. The second pair of interfaces has an outer door opening at its edge. The pressing and sealing structure includes multiple electric push rods spaced apart on the outer door opening and rubber sealing heads set on the electric push rods. The rubber sealing heads abut against the rear of the refrigerated truck.

[0005] The beneficial effects are as follows: When not in use, the mobile transfer platform of this utility model can be rotated to a location other than the loading and unloading port to ensure normal parking and loading / unloading operations at the loading and unloading port, thereby improving utilization. In addition, when in use, it can be moved to the loading and unloading port, which can seal the loading and unloading port of the passageway and the rear of the vehicle as much as possible, reducing cold loss. Furthermore, the buffer room of this utility model allows the vehicle to park at an angle relative to the outer wall of the warehouse, reducing the requirements for the depth of the loading and unloading area. It is not only suitable for the renovation of existing cold storage facilities, but also for the construction of new cold storage facilities, resulting in high land utilization.

[0006] Preferably, the transplanting device includes an X-axis traveling mechanism that travels along the X-axis guide rail and a Y-axis moving mechanism disposed on the X-axis traveling mechanism, with the buffer chamber disposed on the Y-axis moving mechanism. More preferably, the X-axis traveling mechanism includes an X-axis motor reducer connected to a traveling frame and disposed on the traveling frame, the X-axis motor reducer being driven by the drive wheels of the traveling frame, causing the traveling frame to move along the X-axis guide rail in the X direction; the Y-axis moving mechanism includes a horizontally disposed mounting frame and a Y-axis motor reducer connected to the traveling wheels of the mounting frame, the Y-axis motor reducer driving the mounting frame to move along the Y-axis guide rail on the traveling frame. In actual operation, the X-axis traveling mechanism can drive the buffer chamber to move back and forth linearly along the X-axis guide rail, thereby realizing its free switching between loading / unloading ports and non-loading / unloading positions. When in use, it can be moved to the loading / unloading port; when not in use, it can be moved to other positions, improving the utilization rate of the loading / unloading port. In addition, the buffer chamber of this invention can be adjusted in the Y direction to ensure that the buffer chamber can enter the door seal of the loading / unloading port, ensuring sealing performance as much as possible.

[0007] Preferably, the top plate, bottom plate, first side plate, and second side plate of the buffer room are all insulation boards to reduce cold loss; the bottom plate and the mounting frame are both trapezoidal structures (more preferably right-angled trapezoidal structures), so that vehicles can be aligned with the inclined side of the bottom plate, allowing vehicles to park at an angle relative to the cold storage, improving the land utilization rate of the loading and unloading area and meeting the parking needs of large vehicles; a polyurethane insulation layer is provided between the bottom plate and the mounting frame to reduce cold loss.

[0008] Preferably, each of the electric push rods has a connector at its moving end, and the rubber sealing head is disposed on the connector. The compression sealing structure also includes an aerogel felt fixed to the outer door opening, with the outer end of the aerogel felt fixedly connected to the connector of the electric push rod. A connecting tail plate is also hinged to the bottom plate of the buffer chamber, and an electro-hydraulic push rod is disposed at the bottom of the mounting frame. The connecting tail plate is connected to the moving end of the electro-hydraulic push rod. The advantages are: this invention allows the connecting tail plate to be placed on the vehicle's floor, with the aerogel felt arranged circumferentially along the outer door opening (excluding the bottom of the outer door opening). Combined with the connecting tail plate, it ensures the sealing performance between the buffer chamber and the vehicle, minimizing losses. Furthermore, the electric push rod enables the aerogel felt to be unfolded and stacked, meeting the sealing connection requirements of different vehicles and buffer chambers.

[0009] Preferably, the mobile transfer platform further includes a control system, which includes a controller, an alarm unit, an X-axis monitoring unit for monitoring the X-axis walking mechanism's position, a Y-axis monitoring unit for monitoring the Y-axis moving mechanism's position, a tailplate monitoring unit for monitoring the tailplate's position, and a push rod monitoring unit for monitoring the electric push rod. The signal output terminals of the X-axis monitoring unit, Y-axis monitoring unit, tailplate monitoring unit, and push rod monitoring unit are connected to the signal input terminal of the controller, and the alarm signal output terminal of the controller is connected to the alarm signal input terminal of the alarm unit. This enables monitoring of the positions of the X-axis walking mechanism, Y-axis moving mechanism, electric push rod, and tailplate, thereby improving safety.

[0010] Compared with the prior art, the advantages of this utility model are: This utility model's mobile transfer platform can be rotated to a non-loading / unloading port when not in use, ensuring normal parking and loading / unloading operations at the loading / unloading port and improving utilization. Furthermore, when in use, it can be moved to the loading / unloading port, allowing for a more airtight connection between the loading / unloading port and the rear of the vehicle, preventing heat exchange and reducing cold loss. Moreover, the buffer zone of this utility model allows vehicles to park at an angle relative to the warehouse's outer wall, reducing the depth requirements of the loading / unloading area. This meets the parking and loading / unloading needs of large vehicles in front of shallow cold storage facilities. For newly built cold storage areas, it effectively saves the area of ​​the loading / unloading area in front of the cold storage, improving land utilization. Attached Figure Description

[0011] Figure 1 This is a diagram showing the relative relationship between the X-direction traveling mechanism, the cold storage passage, and the vehicle in this utility model.

[0012] Figure 2 yes Figure 1 A schematic diagram of direction AA.

[0013] Figure 3 yes Figure 2A schematic diagram of the central sealing and clamping structure.

[0014] Figure 4 yes Figure 3 A schematic diagram of the electric linear actuator.

[0015] Figure 5 This is a top view of the Y-axis moving mechanism, the base plate, and the connecting tail plate (the connecting tail plate is in a horizontal position).

[0016] Figure 6 yes Figure 5 A schematic diagram of the BB direction.

[0017] Figure 7 This is a folding diagram of the connecting tailplate.

[0018] Figure 8 This is a circuit block diagram of this utility model. Detailed Implementation

[0019] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0020] It should be noted that in the description of this utility model, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 based on the specific circumstances.

[0022] like Figure 1-5 As shown, this utility model proposes a mobile transfer platform for cold chain logistics, including an X-guide rail 1 parallel to the outer wall of the cold storage, a transfer device that travels along the X-guide rail 1, a buffer room 4 set on the transfer device, and a compression sealing structure set on the side wall of the buffer room 4. Two mounting grooves are excavated on the ground outside the outer wall of the cold storage. An X-guide rail 1 is laid in each groove, achieving a concealed installation of the X-guide rail 1. This protects the X-guide rail 1 from impacts and prevents it from protruding from the ground and interfering with vehicle parking. See details below. Figure 1 ; The transplanting device includes an X-direction traveling mechanism 2 that travels along an X-direction guide rail 1 and a Y-direction moving mechanism 3 mounted on the X-direction traveling mechanism 2. A buffer chamber 4 is mounted on the Y-direction moving mechanism 3. During operation, the X-direction traveling mechanism 2 can drive the buffer chamber 4 to move back and forth along the X-direction in a straight line via the Y-direction moving mechanism 3, allowing the device to move between the loading / unloading port and non-loading / unloading port. When in use, it can be moved to the loading / unloading port, and when not in use, it can be moved to a non-loading / unloading position, thereby improving the utilization rate of the loading / unloading port and thus improving the inbound and outbound efficiency of the cold storage. The buffer room 4 is a hollow structure formed by a top plate, a bottom plate 4.1, a first side plate, and a second side plate. The bottom plate 4.1 is horizontally installed on the Y-axis moving mechanism 3. The buffer room 4 has a first pair of interfaces that connect with the loading and unloading port and a second pair of interfaces that connect with the refrigerated truck. The first pair of interfaces is a rectangular opening parallel to the outer wall of the cold storage. In actual installation, the height of the top plate of the buffer room 4 is lower than the door seal of the loading and unloading port to ensure that the buffer room 4 can be aligned with the loading and unloading port, and the door curtain at the loading and unloading port can be draped over the top plate to minimize cold loss. The second interface has an acute angle with the outer wall of the cold storage, allowing refrigerated trucks to park at an angle relative to the cold storage, reducing the depth requirements of the loading and unloading area. This meets the parking needs of large vehicles in cold storage facilities with smaller loading and unloading areas, and is suitable for both existing and newly built cold storage facilities, improving land utilization and having significant promotional value. The second interface has an outer doorway 4.2 (its height is slightly lower than the top plate of the buffer room 4). The outer doorway 4.2 is located outside the second interface. The sealing structure includes multiple electric push rods 5.1 spaced apart on the outer doorway 4.2 (spaced apart along the two side walls and the top wall of the outer doorway 4.2) and rubber sealing heads 5.2 on the electric push rods 5.1. After the electric push rods 5.1 extend, the rubber sealing heads 5.2 can abut against the rear of the vehicle, pressing the rear compartment of the vehicle.

[0023] The mobile transfer platform of this utility model can be rotated to a non-loading / unloading port when not in use, ensuring normal parking and loading / unloading operations at the loading / unloading port and improving utilization. In addition, when in use, it can be moved to the loading / unloading port, which can seal the loading / unloading port of the passageway and the rear of the vehicle as much as possible, reducing cold loss. Furthermore, the buffer room 4 of this utility model allows the vehicle to park at an angle relative to the outer wall of the warehouse, reducing the requirements for the depth of the loading / unloading area. It is not only suitable for the renovation of existing cold storage, but also for the construction of new cold storage, thus improving land utilization.

[0024] In actual installation, the X-axis traveling mechanism 2 includes a traveling frame 2.1 and an X-axis motor reducer 2.2 mounted on the traveling frame 2.1. The traveling frame 2.1 includes a movable crossbeam 2.1a arranged in the X direction and a connecting beam 2.1b connecting two movable crossbeams 2.1a together. Multiple pairs of drive wheels 2.3 are mounted on the bottom of the two movable crossbeams 2.1a, each pair of drive wheels 2.3 connected by an axle. The X-axis motor reducer 2.2 can be connected to one of the drive wheels 2.3 (of course, in actual installation, there can be one set of X-axis motor reducers 2.2, or two or more sets, to meet the traveling requirements). The X-axis motor reducer can drive the traveling frame 2.1 to move back and forth in a straight line in the X direction, thereby meeting the movement requirements of the buffer room 4 in the Y direction. See details... Figure 1 and Figure 2 .

[0025] In actual installation, combined with Figure 5-6 It is understood that the Y-axis moving mechanism 3 includes a horizontally arranged mounting frame and a Y-axis motor reducer 3.1 connected to the traveling wheels 3.2 of the mounting frame. A Y-axis guide rail is provided on the traveling frame 2.1, and the mounting frame has traveling wheels 3.2 that travel along the Y-axis guide rail. The Y-axis motor reducer 3.1 is connected to one of the traveling wheels 3.2 via a transmission connection, and the Y-axis motor reducer 3.1 drives the mounting frame to move along the Y-axis guide rail on the traveling frame 2.1. During operation, the X-axis moving mechanism 2 can drive the buffer chamber 4 to move linearly back and forth along the X-axis guide rail 1, thereby achieving free switching between the loading / unloading port and non-loading / unloading positions. When in use, it can be moved to the loading / unloading port; when not in use, it can be moved to other positions, improving the utilization rate of the loading / unloading port. Furthermore, the buffer chamber 4 of this invention can be adjusted in the Y direction to ensure a reliable connection between the buffer chamber 4 and the loading / unloading port.

[0026] In actual installation, the mounting frame F has a double-layer structure. Both the upper and lower layers include Y-direction beams 3.3 corresponding to the Y-guide rails, and connecting crossbeams 3.4 and connecting diagonal beams 3.5 for connecting the Y-direction beams 3.3, making the overall mounting frame trapezoidal in shape. The upper and lower layers are connected by vertical beams 3.6, as detailed in [link to details]. Figure 5-6 In actual processing, the top plate, bottom plate 4.1, first side plate, and second side plate of the buffer room 4 are all made of insulation board to reduce cold loss; the walking frame 2.1, bottom plate 4.1, and mounting frame are all trapezoidal structures (preferably right-angled trapezoidal structures), and vehicles can be aligned with the inclined side of the bottom plate 4.1, so that vehicles can be parked at an angle relative to the cold storage, improving the land utilization rate of the loading and unloading area and meeting the parking needs of large vehicles; a polyurethane insulation layer is set between the bottom plate 4.1 and the mounting frame to reduce cold loss.

[0027] In actual installation, each electric push rod 5.1 has a connector 5.3 (which can be made of lightweight C-shaped steel or plastic) at its moving end, and a rubber sealing head 5.2 is installed on the connector 5.3. The compression sealing structure also includes an aerogel felt 5.4 fixed to the outer door opening 4.2. The outer end of the aerogel felt 5.4 is fixed to the connector 5.3 of each electric push rod 5.1. When the electric push rods 5.1 are pushed out simultaneously, the aerogel felt 5.4 can be unfolded. When the electric push rods 5.1 are retracted, the aerogel felt 5.4 can be stacked together, which can adjust the distance between the buffer chamber 4 and the vehicle and minimize the loss of cold air. See details. Figure 3-4 ; Combination Figure 5-7 It can be seen that a connecting tail plate 4.3 is also hinged to the bottom plate 4.1 of the buffer chamber 4. An electro-hydraulic push rod 6 is provided at the bottom of the bottom plate 4.3. The connecting tail plate 4.3 is connected to the moving end of the electro-hydraulic push rod 6, so that the connecting tail plate 4.3 can be placed on the bottom plate of the vehicle body, which is convenient for loading and unloading and can also reduce the influence of outside air.

[0028] Combination Figure 8 It is understood that the mobile transfer platform of this utility model also includes a control system. The control system includes a controller, an alarm unit, an X-axis monitoring unit for monitoring the walking position of the X-axis walking mechanism 2, a Y-axis monitoring unit for monitoring the position of the Y-axis moving mechanism 3, a tail plate monitoring unit for monitoring the position of the connecting tail plate 4.3, and a push rod monitoring unit for monitoring the electric push rod 5.1. The signal output terminals of the X-axis monitoring unit, the Y-axis monitoring unit, the tail plate monitoring unit, and the push rod monitoring unit are connected to the signal input terminal of the controller. The alarm signal output terminal of the controller is connected to the alarm signal input terminal of the alarm unit. This enables the monitoring of the positions of the X-axis walking mechanism 2, the Y-axis moving mechanism 3, the electric push rod 5.1, and the connecting tail plate 4.3, thereby improving safety. The X-axis monitoring unit includes two X-axis limit switches, which can limit the X-axis position of this utility model to ensure reciprocation between the loading / unloading position and the non-loading / unloading position. When the X-axis limit switch is triggered, the X-axis motor reducer 2.2 stops working. Similarly, the Y-axis monitoring unit includes two Y-axis limit switches, which can limit the left and right positions of the buffer chamber 4. When the Y-axis limit switch is triggered, the Y-axis motor reducer 3.1 stops working. The tail plate monitoring unit includes an extension limit switch and a retraction limit switch. The controller can adjust the state of the tail plate 4.3 by controlling the duration, so that it can rotate relative to the base plate 4.1. The extension and retraction limit switches are used to limit the electro-hydraulic actuator 6. When it runs to the limit position, the limit switch transmits a signal to the controller. The controller analyzes the signal and transmits it to the alarm unit to alarm, and the electro-hydraulic actuator 6 stops moving. Similarly, the actuator monitoring unit includes two actuator limit switches (one for extension and one for retraction), which can limit the extension and retraction of the electric actuator 5.1 to prevent it from exceeding its design stroke and protect the electric actuator 5.1. The control input terminals of the X-axis motor reducer, Y-axis motor reducer, electric actuator, and electro-hydraulic actuator are connected to the control output terminals of the controller to achieve automatic control. Of course, in actual installation, the X-axis motor reducer, Y-axis motor reducer, electric actuator, and electro-hydraulic actuator are also equipped with manual buttons for easy manual start and stop.

[0029] It should be noted that the aforementioned controller can be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), or a state machine. It can also be a PLC controller, or an industrial control computer with computer attributes and characteristics, etc. Furthermore, the controller of this utility model can also be equipped with a wireless communication module to realize the connection with a remote terminal and receive control commands from the remote terminal.

[0030] The specific working process of this utility model is as follows: When not in use, this utility model is moved to a non-loading / unloading position to avoid the loading / unloading port, so as to meet the parking and loading / unloading needs of other vehicles at the loading / unloading port and improve the utilization rate of the loading / unloading position; when a large vehicle comes, this utility model is moved to the loading / unloading port corresponding to the large vehicle until the first pair of interfaces of the buffer chamber 4 are aligned with the loading / unloading port; then the Y-direction motor reducer 3.1 is started to drive the buffer chamber 4 to perform Y-direction adjustment (i.e., Figure 1(In the left and right directions); use the electro-hydraulic actuator 6 to adjust the connecting tail plate 4.3 so that it rotates upward with the side of the base plate 4.1 as the reference (i.e., the connecting tail plate 4.3 tilts upward), align the rear of the large vehicle with the external opening and reverse. After the large vehicle is in place, lower the connecting tail plate 4.3 so that it rests on the floor of the carriage; then start the electric actuator 5.1, the electric actuator 5.1 extends, the rubber sealing head 5.2 contacts the carriage and presses it tightly; the aerogel felt 5.4 can be unfolded to the carriage along with the electric actuator 5.1 to minimize heat exchange.

[0031] Finally, it should be emphasized that the above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Therefore, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mobile transfer platform for cold chain logistics, characterized in that: The system includes an X-shaped guide rail parallel to the outer wall of the cold storage, a transplanting device that travels along the X-shaped guide rail, a buffer chamber set on the transplanting device, and a compression sealing structure set on the side wall of the buffer chamber. The buffer chamber is a hollow structure formed by a top plate, a bottom plate, a first side plate, and a second side plate. The bottom plate is horizontally installed on the transplanting device. The buffer chamber has a first pair of interfaces that connect with the loading and unloading port and a second pair of interfaces that connect with the refrigerated truck. The first pair of interfaces is a rectangular opening parallel to the outer wall of the cold storage. The second pair of interfaces forms an acute angle with the outer wall of the cold storage, allowing the refrigerated truck to park obliquely relative to the cold storage. The second pair of interfaces has an outer door opening at its edge. The compression sealing structure includes multiple electric push rods spaced apart on the outer door opening and rubber sealing heads set on the electric push rods. The rubber sealing heads abut against the rear of the refrigerated truck.

2. The mobile transfer platform for cold chain logistics according to claim 1, characterized in that: The transplanting device includes an X-axis traveling mechanism that travels along the X-axis guide rail and a Y-axis moving mechanism disposed on the X-axis traveling mechanism, and the buffer room is disposed on the Y-axis moving mechanism.

3. The mobile transfer platform for cold chain logistics according to claim 2, characterized in that: The X-axis traveling mechanism includes a traveling frame and an X-axis motor reducer mounted on the traveling frame. The X-axis motor reducer is connected to the drive wheel of the traveling frame, causing the traveling frame to move along the X-axis guide rail in the X direction. The Y-axis moving mechanism includes a horizontally arranged mounting frame and a Y-axis motor reducer connected to the traveling wheels of the mounting frame. The Y-axis motor reducer drives the mounting frame to move along the Y-axis guide rail on the traveling frame.

4. The mobile transfer platform for cold chain logistics according to claim 3, characterized in that: The top plate, bottom plate, first side plate, and second side plate of the buffer room are all insulated boards. The bottom plate and the mounting frame are both trapezoidal structures, and a polyurethane insulation layer is provided between the bottom plate and the mounting frame.

5. The mobile transfer platform for cold chain logistics according to claim 3, characterized in that: Each of the electric push rods has a connector on its moving end, and the rubber sealing head is disposed on the connector; the compression sealing structure also includes an aerogel felt fixed to the outer door opening, and the outer end of the aerogel felt is fixedly connected to the connector of the electric push rod. A connecting tail plate is also hinged to the bottom plate of the buffer chamber, and an electro-hydraulic actuator is provided at the bottom of the mounting frame. The connecting tail plate is connected to the moving end of the electro-hydraulic actuator.

6. The mobile transfer platform for cold chain logistics according to claim 5, characterized in that: The mobile transfer platform also includes a control system, which includes a controller, an alarm unit, an X-axis monitoring unit for monitoring the X-axis walking mechanism's position, a Y-axis monitoring unit for monitoring the Y-axis moving mechanism's position, a tailplate monitoring unit for monitoring the tailplate's position, and a push rod monitoring unit for monitoring the electric push rod. The signal output terminals of the X-axis monitoring unit, Y-axis monitoring unit, tailplate monitoring unit, and push rod monitoring unit are connected to the signal input terminal of the controller, and the alarm signal output terminal of the controller is connected to the alarm signal input terminal of the alarm unit.

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